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Here are solid 2WD robot chassis options, ranging from budget acrylic bases to sturdier aluminium platforms (some include DC motors + wheels + caster so you can start building immediately):

Budget 2WD chassis (good starter bases)

• Smart Car Chassis 2WD V15 ($23.85) — laser-cut acrylic platform with two 1:48 geared motors, wheels, encoder discs, and a caster.
• 2WD Aluminum Alloy Smart Car Platform Chassis Kit ($30.05) — aluminium alloy 2WD base for a more durable, rigid build.

Compact round 2WD chassis (aluminium kits)

• Mini Round Robot Chassis Kit - 2WD with DC Motors ($40.10) — compact metal plate chassis with 2× DC motors, wheels, and caster.
• Mini 3-Layer Round Robot Chassis Kit - 2WD with DC Motors ($50.15) — similar 2WD round base but with 3 layers for easier stacking of controller/battery/sensors.

Rover-style 2WD chassis (roomier layout)

• Mini Robot Rover Chassis Kit - 2WD with DC Motors ($50.15) — compact rover format with anodised aluminium chassis plus 2× DC motors, wheels, and caster.

Higher-end small 2WD platform + upgrade path

• 2WD miniQ Robot Chassis ($62.80) — compact round 122mm chassis platform popular for indoor/maze-style projects.
• MiniQ Discovery Robot Kit ($142.55) — full 2WD robot kit built on MiniQ with a controller and sensors (more complete than a bare chassis).

Raspberry Pi-friendly rover chassis

• STS-Pi - Build a Roving Robot! ($47.70) — robot chassis designed for Raspberry Pi builds (notably with Explorer HAT/pHAT style projects).