: Retailers like Toytooth and Sears offer multi-packs that include battery clips, mounting brackets, and assorted plastic gears. Robotics & Precise Motion
N20 DC Gear Motor With All Metal Gearbox And Magnetic Hall Encoder For High Precision Reduction Includes L Shaped 6 Pin Connector Rugged Durable Motor VXB.com Bearings Go to product viewer dialog for this item. dc motor buy online
: A reliable 4.5V to 9V motor from Adafruit Industries that fits most small electronics. : Retailers like Toytooth and Sears offer multi-packs