Lego Crazy Action Contraptions Kit by Klutz

Klutz LEGO Chain Reactions Craft Kit

Klutz Lego Gadgets

LEGO Technic Power Functions Motor Set 8293

Klutz Lego Make Your Own Movie Kit

The LEGO Power Functions Idea Book, Volume 1: Machines and Mechanisms

Snap Circuits Jr. SC-100 Electronics Exploration Kit | Over 100 STEM Projects | 4-Color Project Manual | 30 Snap Modules | Unlimited Fun

LEGO Technic COMPLETE GEARBOX ASSEMBLY 2 x 4 x 3 1/3 Trans-Clear Wormbox gear motor REDUCER block Mindstorms robotics ev3 NXT transparent robot building power functions part 6588

LEGO Technic Gears Assortment Pack

Klutz Circuit Clay Science Kit

Awesome LEGO Creations with Bricks You Already Have: 50 New Robots, Dragons, Race Cars, Planes, Wild Animals and Other Exciting Projects to Build Imaginative Worlds