I have three PCBs pulled from discarded machines. I do not have the equipment to test if these work. They are pictured as they are now. I'm more interested in trade than I am in sale.
DigDug:

Post-It note on the bezel of this machine said it powered up but presented garbled graphics.
Centipede:

I also have the trackball that was on this cab. Pics if interested. The ball is pretty dingy.
Cruisin' USA:

The yellow dust is 100% South Carolina Pine Pollen included at no extra charge! There is some slight rust around a microswitch near the battery. Five of the chips are missing stickers over the little window. Doesn't that cause them to loose the contents when exposed to UV? Maybe they can be re-burned from rom images?
Make me an offer. I have no idea what these might be worth given that I cannot vouch for their quality. Maybe all three work and the DigDug just needed a better power supply, maybe none of them work and they'll just make an interesting shadowbox in someone's home game room.