Smart Circuits $23.57 at Amazon (regularly $50)

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Amazon has Smart Circuits on sale for $23.57 (regularly $49.99).

Explore unlimited electronic projects to create working games and gadgets with snap-together base boards, light and sound modules, a microprocessor, and jumper wires. Complete the circuit to make cool gadgets like a light-sensing electronic rooster, a musical baton, a doorbell, and a motion-sensing room alarm.