Snap Circuits Jr. SC-100 is one of those toys that is highly educational but the kids don’t realize it because it is so much fun! I first bought one of these about 4 years ago from a Science Museum and it has had so much use. It is available for $21.95 on Amazon (with free shipping if you have Amazon Prime).
Kids can build over 100 projects with this Snap Circuits set which has won The National Parenting Center-Seal of Approval, Dr. Toy 100 Best Children’s Products,and Dr Toy Best Educational Toy awards. Projects my boys really like are being able to make a light bulb work with a simple circuit, but their favorite has to be making to wheel fly and spin.