This place is pretty awesome. Half museum, half hobby shop, all arcade. It's mostly pinball machines from the 1950s on, but there are some other standouts, including a few slot machines, air hockey, and some skiball-style bowling machines. At any giving time, it looks like a good percentage of the machines are down for repairs, but I can't complain, because there is more than enough to do here.
Seek out the 1933 World's Fair pinball machine for a really neat game.
$10 gets you unlimited play starting at 7pm.