Get kids an old computer. They prefer something big they can see, with switches that make a resounding clunk, and drives that make clanking noises.

To a kid, playing games from the 1980s off a floppy disk is not a significantly difficult experience than using the very latest technology, but I suspect the former is far better for their developing brains.

Meanwhile, you can get them to learn how to type on the keyboard and learn the basics of needing to type in commands to make the computer do something, which is a lifelong skill - tapping icons on a tablet is not.

Cool idea. Where would I get one?

Don't give kids a computer, give them a camera. A real one.