Amazon offers Prime members the SmartLab Toys Smart Circuits Games & Gadgets Electronics Lab for $26.08 with free shipping. That's $2 under our December mention and the lowest price we could find by $20. It includes six base boards, a battery module, variable resistor module, microprocessor module, tricolor LED module, speaker module, photodiode module, tilt switch module, 6-LED array module, two push-button modules, 31 jumper wires, and 48-page lab book. Three AAA batteries are required, but not included.