I want to buy a claw machine and put all of my kids stuffed toys in it. It will keep all the stuffed toys contained and the kids get a lesson in capitalism.
If they're older than about 10 or so, you can build one from scratch with them with an Arduino board. They'd learn a lot -- basic carpentry, painting, basic Arduino coding, wiring, etc.. Capitalism is easier to survive in if one is armed with such skills.
I have many skills. My soon to be 11 year old is very interested in my mechanical and carpentry skills. I recently bought her a few electric and science experiment kits (think Heathkit) and she is really into them.