littleBits: Electronic Building Kits for Kids | Sphero
Amazon.com: littleBits Electronic Music Inventor Kit - for 96 months to 1320 months, Build, Customize, & Play Your Own Educational & Fun High-Tech Instruments! : Toys & Games
Amazon offers up to 50% off select STEM toys: littleBits Rule Your Room Kit $50, K'NEX Simple Machines $15, more