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!
Typically Amazon or Ali Express. RetroGamesCorp has created a couple review videos on them.
Even then you could get an old computer (or laptop) and install Lakka on it and just download the ROMs yourself. The whole setup process can be done in a weekend. After that you could just get some cheap knock off Xbox 360 controllers.