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Best Lego Technic Sets with Power Functions & Motors » Lego Sets Guide
LEGO 8881 Power Functions Battery Box – $6.99
Alternative LEGO Power Functions Motor Set (8293) – Green Gecko Workshop
Amazon.com: SEEMEY 32Pcs Power Function Kit Set Motor Battery Infrared-Remote-Control Receiver Train Adjustable Speed Motor Parts, Motor Power Change Parts Compatible with Lego Technic-Parts : Toys & Games