Availability and cost may make this a DIY project. I just had the idea that since I'd be using tokens anyhow, why not have a dispenser of some kind for that added bit of reality.
IMO, there has to be working coin mechs on the machine. It almost ceases being an arcade the moment you no longer have to pump it with quarters/tokens. And just for convenience, I'd much rather not deal with any kind of money as tokens can substitute just fine.
So, I suppose one could just have a bucket of tokens nearby, but then again we could not go through all of the expense of buildign the machine in the first place. Some kind of token apparatus would just be another one of those neat features.