I have a metal touchscreen slot machine that says "Pyramid Power" or something similar on the marquee. The circuit boards are missing, but it does have a serial touchscreen, power supply and electronic coin comparator. It pretty much looks like the casino ones, red metal case and lights on top and everything.
If anyone has any interest I can pull it out of storage and take some pictures of it. At the moment I was thinking $50 and I haven't tested any of the components.