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Mini Robot Rover Chassis Kit - 2WD with DC Motors : ID 2939 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: EMOZNY 4 Wheel 2 Layer Robot Smart Car Chassis Kits with Speed Encoder for Arduino DIY (Yellow) : Toys & Games
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Amazon.com: Professional DIY Tracked Robot Chassis Smart Tank Car Platform Kit with 2pcs High Torque DC Motors, Caterpillar Robotic Crawler Sciences Eduactional Model for Arduino Raspberry Pi STEAM : Everything Else
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