I made my kids a raspberry pi emulator and they love it. It plays nintendo, sega, playstation n64 games, SNES, etc. I got N64, nes, SNES, sega knockoff controllers. Everything cost less than $100 total off ebay.

I heard a bunch of rom sites were shut down recently this year. Finding roms online will be a little bit harder.

This geek seems to keep up on things.