| OS Engines Piston Pin Gt33** | hobbytechtoys.com.au | 9 AUD | 17.99 AUD | −50% |
| OS 23325100 Silencer Extension Adaptor** | hobbytechtoys.com.au | 7.49 AUD | 14.99 AUD | −50% |
| O.S. Speed R21 Shimo Edition 3 Racing Engine Combo (TR03 EFRA2196 & MR05) | racerc.gr | 569 EUR | 609 EUR | −6.6% |
| O.S. Engines 24603000 Cylinder and Piston for .46 AX Engine | airsail.co.nz | 792.02 NZD | — | — |
| OS Engines Speed R21 Euro II .21 Nitro On Road Engine with TR01 Pipe and MR02 Manifold | hobbytechtoys.com.au | 729.99 AUD | — | — |
| OS Engines Speed B21 Adam Drake 4 .21 Buggy Engine with T-2090 Pipe | hobbytechtoys.com.au | 699.99 AUD | — | — |
| OS Engines R21GT II Nitro On Road Engine with TB01 Pipe and MB01-70 Header | hobbytechtoys.com.au | 689.99 AUD | — | — |
| OS Engines Speed B2105 .21 Nitro Buggy Engine with TB02 Pipe | hobbytechtoys.com.au | 679.99 AUD | — | — |
| OS Engines T1205 .12 Size Nitro On Road Touring Car Engine with TT03 Silencer, OSM1F501 | hobbytechtoys.com.au | 649.99 AUD | — | — |
| Moteur O.S. SPEED R21 SHIMO EDITION 3 Combo Set - 1FG01 - TR03 EFRA2196 + MR05 - 1/8 On-Road | racingmodelisme.com | 524 EUR | — | — |
| OS Engines Carburetor HAD313, GT60 | hobbytechtoys.com.au | 498.99 AUD | — | — |
| OS Engines MAX-R21 V2 .21 Club Spec Nitro On-Road Engine | hobbytechtoys.com.au | 479.99 AUD | — | — |
| OS Engines .21 TM Monster Truck Engine with Revo Manifold | hobbytechtoys.com.au | 469.99 AUD | — | — |
| OS Engines Fr7-420 Collector Ring Exhaust (R) | hobbytechtoys.com.au | 448.99 AUD | — | — |
| OS Engines MAX-12TG Version 5 .12 Nitro On-Road Engine with 1080SC MT02 Pipe and Header | hobbytechtoys.com.au | 439.99 AUD | — | — |
| OS Engines Powerboost Pipe 105 | hobbytechtoys.com.au | 382.99 AUD | — | — |
| OS Engines KRG-01 Kill Switch | hobbytechtoys.com.au | 382.99 AUD | — | — |
| OS Engines Carburettor Complete Ff320.Ft160 | hobbytechtoys.com.au | 332.99 AUD | — | — |
| OS Engines Carburettor Complete (40l-R) 55hz-R | hobbytechtoys.com.au | 332.99 AUD | — | — |
| OS Engines MAX-12TG Version 5 .12 Nitro On-Road Engine | hobbytechtoys.com.au | 299.99 AUD | — | — |
| OS Engines Genuine Rear Bearing 46-50-55 SX-HZ #25830010 Replaces #26730005 | airsail.co.nz | 276.35 NZD | — | — |
| OS Engines Complete Built Up Parts Set, R2103 | hobbytechtoys.com.au | 265.99 AUD | — | — |
| OS Engines Built Up Parts Set, B21 Drake and Drake 2 | hobbytechtoys.com.au | 239.99 AUD | — | — |
| OS Engines TR03 Pipe and MR04 Header suit .21 On Road Engine | hobbytechtoys.com.au | 239.99 AUD | — | — |
| OS Engines Built Up Parts Set, B21 Drake AD4 | hobbytechtoys.com.au | 239.99 AUD | — | — |
| OS Engines R21 GT II Built Up Parts Set | hobbytechtoys.com.au | 239.99 AUD | — | — |
| OS Engines Crankshaft, R21 Euro 2 | hobbytechtoys.com.au | 232.99 AUD | — | — |
| OS Engines Crankshaft, R2105 | hobbytechtoys.com.au | 219.99 AUD | — | — |
| OS Engines Crankcase Fsa 155 | hobbytechtoys.com.au | 219.99 AUD | — | — |
| OS Engines Crankshaft, R21GT II | hobbytechtoys.com.au | 219.99 AUD | — | — |
| OS Engines Crankshaft, R2104 | hobbytechtoys.com.au | 219.99 AUD | — | — |
| OS Engines Carburettor Complete 61HA. GT15HZ 600 | hobbytechtoys.com.au | 199.99 AUD | — | — |
| OS Engines Crankshaft, B21 Drake | hobbytechtoys.com.au | 199.99 AUD | — | — |
| OS Engines Piston and Liner Assembly, R21 Shimo 2 | hobbytechtoys.com.au | 199.99 AUD | — | — |
| OS Engines T-2090SC Tune Pipe Set, Tessmann B21, 75mm Header | hobbytechtoys.com.au | 199.99 AUD | — | — |
| OS Engines Crankshaft, B2105 | hobbytechtoys.com.au | 199.99 AUD | — | — |
| OS Engines Built Up Parts Set, MAX R21 V2 | hobbytechtoys.com.au | 196.99 AUD | — | — |
| OS Engines Crankshaft, B2104 | hobbytechtoys.com.au | 195.99 AUD | — | — |
| OS Engines Cylinder and Piston Assembly, R21 Euro 2 | hobbytechtoys.com.au | 193 AUD | — | — |
| OS Engines Drive Washer & Key. PN. #27708000 | airsail.co.nz | 187.46 NZD | — | — |