My college roommate had this little box that had 2 controllers and RCA’d into the TV that contained basically every game from the most important retro consoles. All the important consoles and games pre y2k. Including Nintendo, Atari, Sega, and maybe some arcade. I assume I can’t get it through normal channels because of some of those roms are unsanctioned, but where might I get something like that? Thanks!
Buy an nvidia shield. Install retroarch. Find ROMs and put them on a USB drive, plug into shield. Pair any Bluetooth controller(s?). Play all the games.
If a Shield is not sourceable, a Mad Catz Mojo or RaspberryPi also works. Personally I recommend Intel NUC but Intel for some reason has decided to not make them like they used to anymore.