Strido

Price research sources ​

What this page is: research notes — every offer that was found per item, including alternatives that are dearer, out of stock or superseded. It is not a list to order from. To buy the robot, use the shopping list: it turns these offers into four complete alternative plans with their totals.

Two research passes (2026-10-30) priced the BOM for delivery to Austria. They are reproduced here with their URLs, stock notes and caveats; hardware/bom.yaml holds the selected offers. Prices change: re-check before ordering.

Pass 1 priced an earlier draft of the design (ESP32-S3 DevKitC, one 20 A BEC, heat-set inserts, 4 servo extensions); its strategy totals are superseded by the shopping list. Corrections that apply to both passes: the Bambu A1 mini (180 mm bed) is too small for the 114 × 208 mm shells (use a ≥ 220 mm bed); the Pololu #2813 is rated 6 A continuous at 55 °C (16 A only at 150 °C) and #2808 3 A at 55 °C (Pololu product pages). Pass 2 priced the items that the final design added or changed (XIAO ESP32-S3, two Hobbywing UBEC-10A, Pololu switch, pushbutton, 30 cm extensions, M2/M2.5 hardware).

Strido EU shopping list for an Austrian builder: prices, vendors and bundle strategies (2026-10-30) ​

Answer: Three shops (DigiKey.at, Amazon.de and AliExpress) cover the whole robot BOM for €969.59 delivered. Spreading the order over six shops gets it down to €908.31. An EU-stock-only build costs about €1,149 plus Eckstein's shipping, which I couldn't see. All three totals use the Pi 5 4 GB and exclude tools and the 3D printer.

Sources:

  • Sub-agents: most prices come from pages four research sub-agents fetched today.
  • Amazon.de: I re-fetched every ASIN used in the strategy totals today with curl (buy-box price and stock).
  • DigiKey.at: prices were read in a browser and include 20% Austrian VAT.
  • Conrad.at: prices are shown without VAT. The gross figures here are net × 1.2, so they are calculated, not displayed.
  • DE shops (Welectron, Eckstein, kugellager-*, ruthex, MYBOTSHOP): they show 19% German VAT. Whether checkout switches to Austria's 20% is UNVERIFIED.

1. Offers per item ​

1a. Compute, camera and boards ​

Item (qty)VendorProduct / SKU€ incl. VATStockURL
Pi 5 4 GB (1)DigiKey.atSC1431 (newer revision of SC1111), 2648-SC1431-ND117.18203digikey.at (search 2648-SC1431-ND)
Berrybase.atRPI5-4GB123.90Limitedberrybase.at
WelectronRP1-151400-P118.00 (DE VAT)Out of stockwelectron.com
Reichelt.atRASP PI 5 B 4GB137.55Pre-orderreichelt.at
Pi 5 8 GB (option)DigiKey.atSC1432186.4219,766digikey.at
WelectronRP1-151800-P189.00In stockwelectron.com
Reichelt.at / Berrybase.at–191.59 / 189.00In stock / Limitedreichelt …-359846 / berrybase.at
Active Cooler (1)DigiKey / Welectron / Reichelt / BerrybaseSC11485.33 / 4.90 / 5.60 / 5.90All in stock (Berrybase limited)welectron.com
64 GB A2 microSD (1)Amazon.deSanDisk Extreme 64GB, B09X7CXWQQ26.21In stockamazon.de
Berrybase.atSanDisk Extreme A2 64GB25.90Limitedberrybase.at
Reichelt.atOfficial Raspberry Pi A2 64GB44.62In stockreichelt.at
Cam Module 3 Wide (1)DigiKey.atSC1224, 2648-SC1224-ND37.286,881digikey.at
WelectronOfficial CM3 Wide35.90In stockwelectron.com
Berrybase / Reichelt–39.90 / 38.32Sold out / Out of stockberrybase.at
Cam Module 3 standard (option)Welectron / Berrybase / Reichelt–25.90 / 28.90 / 30.15In stock / Limited / In stockwelectron.com
Pi 5 camera cable, 200 mm (1)DigiKey / Berrybase / WelectronSC1892 / RPI-CC-SM-20 / –1.07 / 1.20 / 1.90In stockberrybase.at
27 W USB-C PSU, EU plugDigiKey (SC1407) / Welectron / Berrybase–12.78 / 11.90 / 12.40In stockDigiKey also lists SC1153, which is the US-plug version; don't order it
ESP32-S3-DevKitC-1-N16R8, genuineReichelt.at44479217.75Out of stockreichelt.at
soyter.plgenuine Espressif20.87 (VAT basis unclear)Out of stocksoyter.pl
DigiKey.at / Mouser.at–not listed / UNVERIFIED (bot block)––
↳ genuine alternativeDigiKey.atESP32-S3-DevKitC-1-N32R16V17.4253digikey.at. Uses octal 1.8 V PSRAM, so GPIO35–37 are not usable
↳ clone N16R8Amazon.deB0FYFF8CB210.07In stockamazon.de
makeroo.deESP32-S3 N16R8 DevKit (made in China; small business, no VAT charged)7.99–makeroo.de (shipping to AT UNVERIFIED)
PCA9685 (1)DigiKey.atAdafruit 815, 1528-815-ND15.92366digikey.at
Amazon.deJZK clone, B06XSFFXQY6.95–amazon.de
Amazon.deDollaTek clone, B0BKZC1XWR7.0410 leftamazon.de
EcksteinQITA clone10.50In stockeckstein-shop.de
LSM6DSOX IMU (1)DigiKey.atAdafruit 443812.73270digikey.at
Amazon.deB085F3F19D20.163 leftamazon.de
Berrybase.atADA443811.90Sold outberrybase.at
INA260 (1)DigiKey.atAdafruit 422610.601,375digikey.at
Eckstein422611.84In stockeckstein-shop.de
BerrybaseADA422610.95Sold outberrybase.at
Waveshare 2" LCD, ST7789 (1)Welectron1734410.90In stockwelectron.com
Amazon.deB081NBBRWS20.16In stockamazon.de
Eckstein–14.27In stockeckstein-shop.de
Pololu D36V50F5 (1)DigiKey.atPololu 4091, 2183-4091-ND (DigiKey Marketplace)48.24215digikey.at
Eckstein–41.59In stockeckstein-shop.de
Berrybase–34.95Sold outberrybase.at
STEMMA QT cable, 100 mm (3)DigiKey.atAdafruit 42101.01 each17,267digikey.at
Amazon.de12-pc JST-SH 4-pin set, B0HB5F48YD9.06In stockamazon.de
Eckstein / Berrybase–2.25 / 1.90–2.30Out of stock–

1b. LiDAR, servos, horns ​

Item (qty)VendorProduct / SKU€ incl. VATStockURL
RPLIDAR C1 (1)Amazon.de (WayPonDEV)B0CP8YRY4470.58Ships in 4–5 daysamazon.de
Amazon.de (Waveshare)B0CT31PH8S103.86In stockamazon.de
Génération RobotsA-000000-0697081.12 (net 67.60 × 1.2, calculated)Not showngenerationrobots.com
MYBOTSHOP.DE–99.95 (DE VAT)In stockmybotshop.de
SPT5435LV-180W (13)AliExpress "DigitalServo Store"4000135787995, variant "35kg-180 Waterproof"13.46 (with alu Arm/Disc horn: 14.21); shipping €5.908,515de.aliexpress.com
Amazon.de"SPT5435LV", B0H17Y4KS2 — rotation angle not stated23.99In stockamazon.de
Amazon.deB0G39ZHL4B22.483 leftamazon.de
Banggood-180 (not waterproof), p-1577509US$27.99 (≈25.05)UNVERIFIEDbanggood.com
25T alu disc horn (4)Amazon.de (DollaTek)5-pack, B07F71J1Q25.03In stockamazon.de
25T alu clamping arm (4)Amazon.de5-pack, B0F5QG8HQS9.0617 leftamazon.de
LindingerSAVÖX 25T single7.90 eachPre-orderlindinger.at
Horns, cheapest routeAliExpressServo bought as "WP Arm" or "WP Disc" variant+0.75 per servo–Same item page as the servos

1c. Power ​

Item (qty)VendorProduct / SKU€ incl. VATStockURL
Servo BECLindingerHobbywing UBEC-10A V2-Car (P/N 30603003): 2–6S in, 6.0/7.4/8.4 V out, 10 A continuous / 15 A peak (manual); the aircraft UBEC-10A (P/N 30603000, 20 A peak) is a different unit26.99 each (sale)Few leftlindinger.at
Amazon.deSPARKHOBBY 10A UBEC clone, B0DK31PYFZ26.63 each3 leftamazon.de
Amazon.deSuoumwa "20A SBEC", B0D4YCJWR3 (continuous rating and minimum input UNVERIFIED)37.75In stockamazon.de
Motion RC EUCastle CC BEC Pro 20A, 010-0004-01 (15 A continuous at 2S, per sub-agent)56.99Not shownmotionrc.com
LiPo 2S 5000 mAh, XT60 (1)Amazon.deGens ace G-Tech 60C, 138×47×25 mm, B0GKP683YF22.18In stockamazon.de
Amazon.deZeee 5200 80C, 2-pack, B08X4GF9DK41.34 per 2In stockamazon.de
LindingerRobbe RO-POWER 5000 2S 35C, 139×46.8×25.9 mm (0.9 mm over the height limit)32.99Few leftlindinger.at
StefansliposhopSLS XTRON 5000 2S 50C hardcase (4 mm bullets)42.501–3 daysstefansliposhop.de
Charger, AC inputAmazon.deHTRC B6AC 80 W, B0F3CYZ6L846.38In stockamazon.de
Robitronic (AT)SkyRC B6AC V2, genuine61.90In stockshop.robitronic.com
LindingerSkyRC B6AC Neo / ISDT 608AC64.99 / 63.99Few leftlindinger.at (9798342 / 9771152)
LiPo bagLindinger / AmazonRobbe 23×30 cm / FLASLD, B09C31KVK16.49 / 14.11–lindinger.at 9787514 / amazon.de
LiPo checkerLindinger / AmazonAbsima / ARCELI, B077Z1N9CS5.95 / 6.04–lindinger.at 9771616 / amazon.de
XT60 pairsAmazon.deGenuine Amass XT60H, 3 pairs, B07C3KH1VT6.44In stockamazon.de
Lindinger / ReicheltRobbe, 3 pairs / Jamara, 1 pair4.99 / 2.01–lindinger.at 9750234 / reichelt.at 207648
ATO fuse holder + 25 A fuseReichelt.atHolder 325426 + fuse 77863.02 + 0.36 eachIn stockreichelt.at (325426, 7786)
Amazon.deHolder 5-pack (with 20 A fuses), B0B4MWDFD8 + 25 A fuses ×10, B09ZXRZLV88.05 + 4.02In stockamazon.de · amazon.de
Main switch ≥30 AAmazon.deXT60 inline switch 30 A, B0FG2NTYXF11.097 leftamazon.de
Silicone wire 14 / 18 / 22 AWGAmazon.deB0C53D343Y (5 m) / B0D12R349S (5+5 m) / B0C7T9KYND (6×4 m)12.10 / 9.06 / 12.10In stockamazon.de/dp/…
Lindinger2.5 mm² / 0.75 mm², 1 m red + 1 m black each4.99 / 2.99–lindinger.at 20479 / 44422
Wago 221-415 (4)Reichelt.at1498000.81 eachIn stockreichelt.at 149800
Amazon.de25-pack, B0107SYYGU14.11In stockamazon.de
Servo extension 15 cm (6)Amazon.de5-pack, B081NVPRNG (buy 2)6.54 per pack20 leftamazon.de
LindingerMultiplex3.90 each–lindinger.at 67983
Dupont F-F / heat-shrink / cable ties / spiral wrapReichelt.at282699 / 152924 / 280182 (velcro) / 3325841.11 / 5.39 / 5.14 / 2.50In stockreichelt.at
Amazon.deB01EV70C78 / B071D7LJ31 / B0BFVRQVFP / B093SQP3PZ7.04 / 8.56 / 7.04 / 6.16In stockamazon.de/dp/…

1d. Mechanical ​

Item (qty)VendorProduct / SKU€ incl. VATStockURL
625ZZ (4)3DJake.at10-pack4.99In stock3djake.at
Amazon.deQUARKZMAN 15-pack, B0CM8TYDR67.36In stockamazon.de
kugellager-express.de625-ZZ0.88 each from 4 (DE VAT)Availablekugellager-express.de
123kugellager.at625-ZZ1.60 each50+123kugellager.at
6805-2RS (4)Amazon.deQUARKZMAN 2-pack, B0CL4Z679J (buy 2)6.74 per packIn stockamazon.de
kugellager-express.de6805/61805-2RS1.70 each from 4Availablekugellager-express.de
kugellager-shop.net / 123kugellager.at–1.90 / 4.36 eachIn stock–
633ZZ (8)Amazon.deQUARKZMAN 8-pack ABEC5, B0GGT3GW6910.273 leftamazon.de
123kugellager.at633-ZZ2.04 each (16.32 for 8)50+123kugellager.at
Plain bearing 3×5×5 (32)Amazon.deQUARKZMAN sintered bronze, 50-pack, B0G15L264D10.274 leftamazon.de
Amazon.deWrapped bushing 10-pack, B0CWRXCWF95.44 per packIn stock–
igus.atiglidur G GSM-0304-05 (3×4.5×5); prices shown excl. VAT50 pcs = 18.50 net (22.20 gross, calculated)24–48 higus.at
M3 SHCS assortmentAmazon.deWZHUIDA 1080 pcs, stainless (40 each of 6/8 mm; 30 each of 10/12/14/16/18/20; 20 each of 25/30/35/40/50; plus 360 nuts, 360 washers), B0D2VST57H17.1417 leftamazon.de
Schraubenking.atDIN 912 A2, loose packs: 6–16 mm in 100s at €2.04–2.35; 18–35 mm in 10s at €0.83–0.97 (cheaper per pack from 3 packs)see leftIn stockschraubenking.at
M3 nyloc DIN 985 (100)Schraubenking / AmazonP000454 / B0GXYB1TWK2.30 / 7.04In stockschraubenking.at / amazon.de
M3 heat-set inserts (30)Amazon.deORTAVA M3×5.7, 100-pack, B0CNGHVWHC7.04In stockamazon.de
3DJake.at / ruthex.deruthex RX-M3x5.7, 100-pack (no 50-pack exists)8.99In stock3djake.at
M2.5 standoff kitAmazon.deGeeekPi 220 pcs brass, B07PHBTTGV12.10In stockamazon.de
M2 screws (20)Schraubenking.atM2×6 DIN 912 A2, 10-pack0.88 per packIn stockschraubenking.at
Amazon.de660-pc M2 kit (button head), B0DJ948G7K8.05In stockamazon.de
Filament, 2 × 1 kg3DJake.atElegoo PLA black / yellow10.39 / kgIn stock3djake.at
Extrudr (Austria)PLA NX2 Matt (−40% sale)15.59 / kgIn stockextrudr.com
Amazon.deSunlu PLA black, B0BTHSX6S3 / light yellow, B0FLWKNF2G13.10 / 15.12In stockamazon.de/dp/…
Bambu EU / Polymaker (3DJake) / PrusamentPLA Basic / PolyTerra / Prusament PLA16.99 refill · 19.99 with spool / 14.99 / 26.39In stockeu.store.bambulab.com/products/pla-basic-filament

1e. Tools (optional; prices from the tools sub-agent) ​

ToolPick (vendor, price €)Alternatives
PrinterBambu A1 mini, 180³ bed: 179 + €10 shipping (eu.store.bambulab.com/products/a1-mini)A1 Combo 339 (A1 without AMS lite: UNVERIFIED); Prusa MK4S kit 719 / assembled 999; CORE One+ 1,049 kit / 1,349 assembled (prusa3d.com). Black Friday prices
Hex keysWera 950/9 Hex-Plus, Amazon 28.22 (B009ODV0OE)Conrad Wera 950 SPKL ≈31.99 (calculated)
Soldering + insert tipsMiniware TS101 74.62 (B0CPDRQZYB) + ruthex tip set 17.04 (B0DP51DDF7) + adapter 13.10 (B0CTQV11YC)Pinecil 82.14; budget Beizkna 22.16 + Preciva tips 25.61 (tip fit UNVERIFIED)
Stripper / crimperJokari Super 4 plus 14.06 / DxCRIMP set with plugs 30.22iCrimp SN-2549 26.21; Knipex 12 62 180 at Conrad ≈34.50
Multimeter / calipers / flush cuttersKaiweets 46.28 / Kynup 18.94 / Wiha 26812 16.09Voltcraft VC131 at Conrad ≈29.99; Knipex 78 61 125 ≈20.99
Drills, tap, filesBosch 3 mm ×10: 6.04; Bosch 5 mm: 1.91 (B078W5CF3D); tap set with wrench: 9.95; KS files: 6.85; deburrer: 9.06RS M3 tap at Conrad ≈3.34
Thread locker / CA glueLoctite 243, 5 ml: 8.11 / Pattex Ultra Gel: 5.80–
Tools subtotal, all Amazon€306.29 (budget iron variant €249.30); free shipping if added to the robot's Amazon orderPrinter extra: €189 (A1 mini + shipping)

2. Shipping to Austria ​

VendorShipping to ATFree fromSource
DigiKey.at€25€75Banner on the digikey.at product page. Whether Marketplace items (the Pololu) count toward it is UNVERIFIED
Amazon.de€3.99 home / €1.99 pickup point (Amazon-shipped items)€39amazon.de
Amazon.de parcel tax+€2.40 per order (Austrian Paketsteuer, charged at checkout)–amazon.de · BMF: bmf.gv.at
Berrybase.atDHL €5.95€200 on the shipping page; €150 on the banner (conflicting)berrybase.at
Reichelt.atDPD €6.95UNVERIFIEDreichelt.at
WelectronUPS €9.90 (≤2 kg) / DHL €14.90€200 (DHL)welectron.com
EcksteinUNVERIFIED (only shown in the cart)UNVERIFIEDeckstein-shop.de
Lindinger.at€5.99€89 (not for dangerous goods or bulky items)lindinger.at
3DJake.at€5.49€49.903djake.at
Schraubenking.at€5.90€99schraubenking.at
kugellager-express.de / kugellager-shop.net€8.90 / €8.50None for ATkugellager-express.de
ruthex.de€9.90€80ruthex.de
Extrudrfrom €6.905 itemsextrudr.com
Bambu EUPrinter €10; filament €10Filament from €55; printers never freeeu.store.bambulab.com
Robitronic / Motion RC EU€5.90 / €6.99– / €99shop.robitronic.com/de/versandkosten · motionrc.eu
StefansliposhopUPS €16.61None seenstefansliposhop.de
Conrad.at€6.99€69conrad.at
AliExpress DigitalServo / Fidurobot€5.90 / free from €10–Item pages
igus, 123kugellager, Génération Robots, MYBOTSHOP, Banggood, DFRobot, HobbyKing (blocked)UNVERIFIEDUNVERIFIED–

3. Bundle strategies ​

These cover the full robot BOM with the Pi 5 4 GB, one Camera Module 3 Wide, 13 servos (12 + 1 spare), 4 disc + 4 arm horns and 2 kg of PLA. Tools and printer are excluded. Prices are per section 1.

Shop(a) Fewest shops: subtotal + shipping = total(b) Lowest total(c) Fastest, EU stock only
DigiKey.atPi, cooler, CM3W, cable, PSU, genuine ESP32 N32R16V, Ada 815, 4438, 4226, 4210 ×3, Pololu: 281.57 + 0 = 281.57Same without ESP32 and 815: 248.23 + 0 = 248.23– (ships from the US)
Amazon.deEverything else in the EU: LiDAR (WayPonDEV), LCD, SD, LiPo, HTRC charger, 2× SPARKHOBBY BEC, all wiring, bearings, bushings, screws, inserts, standoffs, Sunlu PLA ×2: 498.74 + 0 + 2.40 = 501.14LiDAR, LCD, SD, LiPo, charger, switch, 6805, 633, bushings, M3 kit, nyloc, inserts, standoffs, M2, extensions, ties, 22 AWG, clone ESP32 + PCA9685: 331.23 + 2.40 = 333.63Items from (a) plus Waveshare C1 (103.86, in stock), Ada 4438, JST-SH set, clone ESP32, 13× Amazon "SPT5435LV" (311.87), horn packs: 850.90 + 2.40 = 853.30
AliExpress (DigitalServo)4× WP Arm + 4× WP Disc + 5× WP: 180.98 + 5.90 = 186.88Same: 186.88–
Reichelt.at–Wago ×4, ATO holder, 2× 25 A fuse, Dupont, heat-shrink, spiral wrap: 15.98 + 6.95 = 22.93–
Lindinger.at–2× Hobbywing UBEC 10A V2, bag, checker, 2.5 mm² + 0.75 mm² wire, XT60 ×3 pairs: 79.39 + 5.99 = 85.38–
3DJake.at–Elegoo PLA black + yellow, 625ZZ 10-pack: 25.77 + 5.49 = 31.26–
Berrybase.at––Pi 4 GB, cooler, SD, cable, PSU: 169.30 + 5.95 = 175.25
Welectron––CM3 Wide, LCD: 46.80 + 9.90 = 56.70
Eckstein––Pololu, INA260, PCA9685 clone: 63.93 + UNVERIFIED shipping
Grand total€969.59 (3 shops)€908.31 (6 shops)€1,149.18 + Eckstein shipping (4 shops)

Trade-offs in the totals:

  • Dropping shops from (b): removing 3DJake costs +€4.32, Lindinger +€15.63 and Reichelt +€25.01.
  • Genuine boards in (b): using the genuine ESP32 (N32R16V) and the Adafruit 815 instead of clones adds €16.32, for €924.63.
  • Pi 5 8 GB: adds €69.24 at DigiKey.
  • Strategy (c) caveats:
    • The Amazon SPT listing doesn't state the rotation angle; a 90° or 270° unit would break the joint mapping. Confirm with the seller before buying 13.
    • "In stock" at Berrybase means LimitedAvailability.
    • No EU shop had the genuine N16R8 ESP32 or the Adafruit LSM6DSOX in quantity; Amazon has 3 of the IMU left.
  • Stock that could change a total: Amazon's 633ZZ (3 left), bronze bushings (4 left), SPARKHOBBY BEC (3 left) and Lindinger's Hobbywing (few left). Order these first.

4. AliExpress and other non-EU options ​

ItemOffer€Note
SPT5435LV-180W ×13DigitalServo Store, item 400013578799513.46 each (14.21 with horn) + 5.90Most-sold listing with the full SPT range. A search summary says it is SPT's exclusive distributor (UNVERIFIED). The 10-pack (155.16) costs more than 10 singles (134.60)
RPLIDAR C1Hefei Fidurobot, 1005006190309082 / FD Robot, 100500879060897766.29 / 65.01, free shippingNeither is an official Slamtec store; only €4–5 cheaper than Amazon.de
RPLIDAR C1DFRobot DFR1138US$69 (≈61.76 net)Shipping and import VAT UNVERIFIED
ESP32-S3 N16R8 cloneitem 1005006240070551US$4.49 (search snippet only, UNVERIFIED)–

Rules for non-EU orders:

  • €3 duty per item: since 1 Jul 2026 the EU charges a flat €3 per item (counted per tariff line, not per unit) on consignments up to €150. The seller pays it (EU Commission).
  • €2 handling fee: from 1 Nov 2026 there is an extra €2 per item (vienna.at). It can be passed on in prices.
  • The servo order is over €150. IOSS (VAT collected at checkout) only applies to consignments up to €150 (Revenue.ie). Above that, the normal import procedure applies, so expect possible carrier VAT and clearance fees. Splitting into two orders of 7 + 6 servos (about €90 each) stays under the limit for +€5.90 shipping. How AliExpress handles this is UNVERIFIED.
  • Delivery and quality: delivery is slow; quality risk is acceptable for horns, bearings, the PCA9685 and the ESP32. Don't buy LiPo, charger or LiDAR there.

5. Clone fine vs genuine matters ​

Clone or generic is fineGenuine or brand matters
PCA9685; bearings (625, 633); bronze bushings; M2/M3 screws, nuts and inserts (stainless A2); standoffs; 25T horns (check the spline); camera cable; LCD (generic ST7789 works); JST-SH cables; Dupont, heat-shrink, ties, spiral wrap, Wago-style connectors; LiPo bag and checker; filament brandServos (genuine SPT, the -180W variant); LiPo (Gens ace, SLS or Robbe class, hardcase, real C rating); LiDAR (real Slamtec C1, for the ROS driver); Pi 5, cameras, PSU (official only); microSD (fakes are common, so buy from Amazon-shipped or retailer stock); Pololu regulator (cheap buck converters overstate current); XT60 (genuine Amass); BEC (Hobbywing or Castle over clones, since it feeds all 13 servos); charger (SkyRC or ISDT preferred; HTRC is clone-tier); 6805-2RS main-joint bearings (play shows up directly at the joint); Loctite 243

6. Caveats that affect the BOM ​

  1. No real "20 A, 6/7.4 V, 2S-input" BEC turned up. A buck regulator can't put out 7.4 V from a 2S pack (6.4–8.4 V), so run the servos at 6.0 V. The sensible options are 2× Hobbywing UBEC-10A V2-Car (10 A continuous / 15 A peak each), each feeding two legs, or a Castle BEC Pro 20A (15 A continuous at 2S per sub-agent).
  2. Genuine ESP32-S3-DevKitC-1-N16R8 is out of stock everywhere checked in the EU (Reichelt, soyter.pl; DigiKey doesn't list it; Mouser was blocked). Pick one:
    • the genuine N32R16V (DigiKey €17.42), giving up GPIO35–37;
    • an N16R8 clone (Amazon €10.07).
  3. igus has no 3×5×5 part. Its 3 mm bore part is 3×4.5×5 (GSM-/JSM-0304-05). Either change the printed bore to 4.5 mm or use bronze 3×5×5.
  4. Shops that changed status:
    • Botland now sells to businesses only (VAT ID required).
    • AZ-Delivery's shop is closed.
    • Mouser, Antratek, RobotShop EU and HobbyKing blocked automated access, so they are not priced.
  5. Austrian parcel tax: €2.40 per order, charged at Amazon checkout. It only applies to distance sellers with more than €100 M in sales, so it doesn't apply to most small EU shops.
  6. LiPo shipping: a 2S 5000 mAh pack is about 37 Wh, under 100 Wh, so it ships at normal rates. Lindinger and SLS add surcharges only above 100 Wh.
  7. DE-VAT shops: Welectron, Eckstein and kugellager-* prices may rise about 0.8% if checkout applies Austria's 20% VAT.
  8. Conrad tool prices are net × 1.2 (calculated). Bambu and Prusa prices are time-limited Black Friday prices.

EU pricing for the 15 extra quadruped BOM items (Austria, 2026-10-30) ​

Every item has at least one offer that I read on the shop's page. Prices are € incl. VAT as shown on 2026-10-30, cheapest first.

Three corrections to the brief:

  • Item 1: Seeed SKU 102010635 is the XIAO ESP32S3 Sense pre-soldered (it has a camera). The plain pre-soldered board is 102010634, and 113991114 is the plain board without headers.
  • Item 2: Pololu #2813 is the Big Pushbutton Power Switch HP (4.5–40 V, about 16 A), not a Mini. No "Mini HP 6 A" exists. #2812 is the Big MP (4.5–40 V, 8 A). The 6 A part is the Mini LV #2808 (2.2–20 V).
  • Item 11: The GeeekPi kit B07PHBTTGV has no M2.5×6 F-F standoffs. You need to buy those separately.

How to read the price columns:

  • Eckstein and Botland show German VAT (19%). The Austrian price may be about 1% higher.
  • Amazon.de prices were fetched without a delivery address, so they likely include German VAT. The Austrian price may differ slightly.
  • "(listing)" means I saw the price only on the Amazon search results page, not the product page. Treat it as UNVERIFIED.
  • DigiKey prices are the "incl. VAT" figure on DigiKey.at.

1. Seeed XIAO ESP32S3 (qty 1) ​

VendorProduct / SKU€PackStockURL
DigiKey.at113991114 plain, no headers (genuine)7.9819,565digikey.at
DigiKey.at102010634 pre-soldered (genuine)9.051159digikey.at
Berrybase.atSE-102010634 "Mit Header" (genuine)9.901100+berrybase.at
Amazon.deB0BYSB66S5, Seeed XIAO ESP32-S316.081Auf Lageramazon.de
  • The Berrybase "Ohne Header" variant is in stock, but I did not see its own price. The page says "From €9.90".
  • Berrybase's €9.50 "XIAO ESP32-S3 Plus" is a different board.

2. Pololu pushbutton power switch (qty 1) ​

VendorProduct€StockURL
Botland.de#2808 Mini LV, 2.2–20 V / 6 A4.50InStockbotland.de
Botland.de#2812 Big MP, 4.5–40 V / 8 A4.90InStockbotland.de
Botland.de#2813 Big HP, 4.5–40 V / 16 A7.90InStockbotland.de
Eckstein (DE)#2808 (PO2808)5.89Available, 1–3 dayseckstein-shop.de
DigiKey.at Marketplace#2808 / #2812 / #28135.98 / 7.18 / 10.80382 / 241 / 156https://www.digikey.at/de/products/result?keywords=pololu 2813
  • Fit for 2S (6.0–8.4 V): all three variants cover that range. #2808 is limited to 20 V, so it would not work at 3S or higher.
  • Which one to pick depends on what the switch carries:
    • If it switches only the logic/Pi branch, #2808 (6 A) is enough.
    • If it switches the whole pack feeding two 10 A UBECs, the battery side can draw about 18 A at full servo load (my estimate). That is beyond #2813's rated ~16 A continuous. In that case keep it out of the servo path and use the XT60 arming loop.
  • DigiKey Marketplace items ship from Pololu in the USA, and the page says a separate shipping fee may apply.
  • Not recommended: Amazon B079NSQ1ML (#2813) at €56.34 (listing). Berrybase POL2812 at €4.90 is not available.

3. 12 mm momentary metal pushbutton, normally open (qty 1) ​

VendorProduct€StockURL
Reichelt.atONPOW VS GQ12B-10S, stainless, screw terminals, momentary NO5.66 (was 7.05)ab Lagerreichelt.at
Reichelt.atONPOW VS GQ12B-10JS, stainless, solder lugs7.46ab Lagerreichelt.at
Amazon.deMetzler 12 mm stainless, B0FH2TX1LN5.53Auf Lageramazon.de
  • Do not buy the Metzler: its page states a 40 mm installation depth, which is over your 30 mm limit.
  • GQ12B depth is UNVERIFIED. The datasheet I fetched had no readable body length. ONPOW describes the series as "short body".
  • GQ12B-10/J/N is the nickel-plated brass version. Reichelt stocks the stainless (S) version.

4. Hobbywing UBEC 10A V2-Car, 2–6S (qty 2) ​

VendorProduct€ eachStockURL
Lindinger.atHW30603003 BEC 10A V2-Car (genuine)26.99 (was 31.98), confirmed"Only a few left in stock", 1–3 dayslindinger.at
Amazon.deSPARKHOBBY UBEC 10A 2–6S, B0DK31PYFZ (clone)26.633 leftamazon.de
Amazon.deHobbywing B0BCWYQYKW (genuine)29.90 from 3 sellers (listing)no Buy Boxamazon.de
  • Two units at Lindinger cost €53.98, plus €5.99 shipping (free from €89).
  • Lindinger's Austrian free-shipping threshold of €89 is confirmed on its site.

5. ATO/ATC inline fuse holder with ≥14 AWG leads, plus 20 A fuses ​

VendorProduct€PackStockURL
Amazon.deNilight NI-FH01, 14 AWG, 12-inch loop, B07426WCLM8.5610 holdersAuf Lageramazon.de
Amazon.deBst4U, 14 AWG, waterproof cap, plus 100 assorted fuses incl. 20 A, B087BT1PH310.076 holders + 100 fusesAuf Lageramazon.de
Reichelt.atFKS 20A ATO fuse0.36 each (0.236 from 10)1ab Lagerreichelt.at
Amazon.deJatilEr 20 A standard blade fuses, B09ZXQ8F3J4.0210Auf Lageramazon.de
  • Reichelt has no wired ATO inline holder. Its nearest option is the IMAXX HLP7335 for mini blade fuses (2.5 mm² leads, 30 A, IP55) at €2.62. It would need FK1 20A mini fuses at €0.41 each. Link: reichelt.at

6. Servo extension cables, 30 cm JR (qty 12) ​

VendorProduct€PackStockURL
Amazon.de30 cm male–female JR, B07FYF76Y1 (gauge not stated)10.071012 leftamazon.de
Amazon.deVUNIVERSUM 30 cm 22 AWG (0.32 mm²), B078VSNC9D11.081011 leftamazon.de
Amazon.deGTIWUNG 30 pcs JR, B082WYFWSY (length mix not checked)12.10 (listing)30?amazon.de
  • You need 12, so buy two packs of 10: 2 × €11.08 = €22.16 for the 22 AWG version.
  • I found nothing suitable at Berrybase or Reichelt. Lindinger was not checked.

7. Pi 5 camera cable, 22-pin to 15-pin, 300 mm (qty 1) ​

VendorProduct€StockURL
DigiKey.atRaspberry Pi SC1129 (official)2.141digikey.at
Berrybase.atRPI-CC-SM-30, official Standard–Mini 300 mm2.30100+berrybase.at
Amazon.deB0CMZPKZFT, sold as "offizielles" (unconfirmed)5.20Auf Lageramazon.de
Amazon.deWaveshare 22-to-15 pin 300 mm, B0CX1SFD449.67Auf Lageramazon.de
  • Reichelt's "RASP CAM FPC 30" at €2.27 is the older orange camera cable, probably 15-to-15 pin. It is not the Pi 5 22-pin type.

8. Short USB-A to USB-C cable, 90° (qty 2) ​

VendorProduct€PackStockURL
Amazon.dedeleyCON 0.15 m USB-A to C 90°, B0FVXP8LXJ4.991Auf Lageramazon.de
Amazon.dedeleyCON 0.15 m USB-A to C 90°, 480 Mbps, B0DGTR2X975.841Auf Lageramazon.de
Amazon.deaceyoon 20 cm USB-A to C 90°, B09ZDV7S447.643Auf Lageramazon.de
  • I found no short USB-A to C cable at Berrybase.

9. Adafruit STEMMA QT cable (qty 1) ​

VendorProduct€StockURL
DigiKey.atAdafruit 4397, JST SH to female sockets, 150 mm1.018https://www.digikey.at/de/products/result?keywords=adafruit 4397
DigiKey.atAdafruit 4209, JST SH to male header1.015https://www.digikey.at/de/products/result?keywords=adafruit 4209
Berrybase.atSeeed SE-114992154, Grove & Qwiic/STEMMA QT to male/female jumpers (alternative)2.503search "stemma qt kabel"
  • Berrybase's Adafruit ADA-JSTSH4 and the SparkFun CAB-14988 / CAB-17261 cables are all "nicht lieferbar".
  • DigiKey's shipping is €25 below €75, so only order 4397 there as part of a bigger DigiKey order.

10. Dupont jumper wires, female–female (1 pack) ​

VendorProduct€StockURL
Berrybase.atDUPK-SET-10: 40-pin F-F + M-M + F-M, 10 cm4.40100+berrybase.at
Berrybase.atDUPK-SET-20: same set, 20 cm4.90100+berrybase.at
Amazon.de120 × F-F 10 cm, B072JT6BCN7.04Auf Lageramazon.de
Amazon.de160 × F-F, 10/20/30/40 cm, B0F98KBV618.05stock field emptyamazon.de

11. M2 and M2.5 hardware ​

GeeekPi B07PHBTTGV, €12.10, in stock. Contents as listed on the page:

PartQty
M2.5 × 20+6 male–female16
M2.5 × 5+6 male–female16
M2.5 × 11+6 male–female16
M2.5 × 11 (probably F-F; my inference)16
M2.5 × 12+64
M2.5 screws50
M2.5 nuts50
Acrylic washers50

There are no 6 mm F-F standoffs in the kit.

NeedVendorProduct€PackStockURL
M2.5 × 6 F-F (≥10)DigiKey.atWürth 970060151, steel hex, female–female0.552 each, so ≈5.52 for 1013,699digikey.at
M2.5 × 6 F-FAmazon.deB0GK7QTZ7B, multi-size F-F brass listing (variant not confirmed)11.292–50Auf Lageramazon.de
M2 × 8 F-F (≥3)Amazon.deB0DR67YGQL, M2×8 brass, female both ends7.73402 leftamazon.de
M2 × 5 DIN 912Schraubenking.atA2 stainless0.86102–3 daysschraubenking.at
M2 × 10 DIN 912Schraubenking.atA2 stainless0.78102–3 daysschraubenking.at
M2 nuts DIN 934Schraubenking.atA2 stainless1.871001 dayschraubenking.at
M2.5 × 5 / × 6 DIN 912Schraubenking.atA2 stainless0.83 each size102–3 days…-P004986 / schraubenking.at
M2.5 nuts DIN 934Schraubenking.atA2 stainlessprice not seen100?schraubenking.at
  • No brass M2 × 8 F-F standoff turned up in a quick DigiKey search.

12. M3 × 40 DIN 912 and M3 DIN 985 nylock nuts ​

WZHUIDA kit B0D2VST57H, €17.14, "Nur noch 17 auf Lager". The listing confirms it does contain M3 × 40:

LengthQty
M3 × 6, M3 × 840 each
M3 × 10, 12, 14, 16, 18, 2030 each
M3 × 25, 30, 35, 40, 5020 each
M3 nuts (plain, not nylock)360
M3 washers360

The screws are 304 stainless with a socket cap ("Zylinderkopf" variant).

NeedVendorProduct€PackStockURL
M3 × 40 DIN 912Schraubenking.atA2 stainless1.0110Sofort verfügbarschraubenking.at
M3 × 40 DIN 912Schraubenking.at8.8 zinc-plated1.16101 dayschraubenking.at
M3 DIN 985 nylockSchraubenking.atzinc-plated steel1.391001 dayschraubenking.at
M3 DIN 985 nylockSchraubenking.atA2 stainless2.301001 dayschraubenking.at
M3 DIN 985 nylockReichelt.atSKSM M3-1003.48100ab Lagerreichelt.at
M3 DIN 985 nylockAmazon.deA2 stainless, B0BJYRLG6G5.5350Auf Lageramazon.de

13. Foam mounting tape (19 mm) and 2.5 mm cable ties (100 pcs) ​

VendorProduct€PackStockURL
Reichelt.attesa PRO Universal 19 mm × 5 m (not VHB)9.981 rollab Lagerreichelt.at
Amazon.de3M VHB 5952F, 19 mm × 3 m × 1.1 mm, B00EDLPG7Y14.111 rollAuf Lageramazon.de
Amazon.de3M VHB 4991, 19 mm × 5.5 m × 2.3 mm, B0779B5LBZ20.591 rollAuf Lageramazon.de
Berrybase.atCable ties 100 × 2.5 mm, white (E-E510)0.901009berrybase.at
Reichelt.atDelock 19186, 100 × 2.5 mm, black, cold-resistant1.16100ab Lagerreichelt.at
Berrybase.atCable ties 100 × 2.5 mm, transparent (D18605)1.901003berrybase.at

14. XT60 arming-loop plug ​

Confirmed. B07C3KH1VT is "3 Paar (6 Stück) Original Amass Premium XT60H … Stecker Buchse Male Female inkl. Schutzkappen". That is 3 male and 3 female connectors, €6.44, in stock: amazon.de

15. Medium-strength thread locker ​

VendorProduct€StockURL
Schraubenking.atFörch thread locker, medium, blue, 10 ml (not Loctite)5.711 dayschraubenking.at
Amazon.deLoctite 243, 5 ml, B00745GNPK8.114 leftamazon.de
Amazon.deLoctite 243, 10 ml, B00Y8DOMCC13.07Auf Lageramazon.de
Reichelt.atLoctite 243, 10 ml15.12ab Lagerreichelt.at

Shipping for shops outside your list ​

  • Botland (ships from Poland): I only saw German terms: from €4.99, free above €100. Rates to Austria are UNVERIFIED.
  • Eckstein (DE): this shop is on your preferred list but you gave no shipping cost for it. The rate to Austria is UNVERIFIED; the shipping-info pages I fetched did not show it.
  • DigiKey Marketplace (Pololu items): shipped by Pololu from the USA, and a separate shipping fee may apply on top of DigiKey's €25 / free from €75.

Not reached ​

  • TME and metzler-electronics.com both block automated access, so I have no prices from them.
  • I did not check Conrad.at or AliExpress.

MIT licence. Mechanical design derived from Yertle by Jerome Graves. CAD, simulation and native tests are not hardware evidence — see Verification.

Strido