ThinkFun Maker Studio – Gears Building Kit

Amazon.com Price:  $14.86 (as of 20/10/2019 06:29 PST- Details)

Make a race car, a cable car, a three-wheeler, a motorcycle or use your imagination to build something all your own
This set features gears and comes with essential engineering parts including gears, a spool, connectors, wheels, rods, and hub caps
10 Engineering challenges encourage exploration and problem solving