My son has been trying out new STEM toys recently. This is the second kit Technology Will Save Us sent us: DIY Electro Dough Kit. He also tried out the DIY Gamer Kit , ARCKit, Snap Circuits, and Sphero.
Out of all these kits, I think my son liked the DIY Electro Dough Kit the most. It’s also the least expensive out of the different things he tried, at $30 for the kit.