For what it's worth, I have seen roughly 1:18th scale arcade cabinets at Cracker Barrel. They have three, but I can only remember the names of two, Pac-Man and Space Invaders. I saw a video of them in action and the screens look incredible! Usually the movement on such small screens is kinda "jerky" for lack of a better term. These screens look exactly like the big versions, clean movement of game characters.
The down-side, they run about $20 each. They have a little keychain type clip on them, but why anyone would actually use them as a keychain is beyond me. At $20, I wouldn't have this dangling off my keys.