RetroGaming

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!