I don't know how much emulation you do, but if you're a big fighting came person, look into fightcade. Its basically an emulator setup for fighting games that has rollback netcode and matchmaking so you can play online against randos (or with friends!). The 1up arcades that were mentioned above are cool, but imo they are very over priced for the quality and what actually comes with them (they are also weirdly small imo)