Picked up a Dig Dug Monday night for $250. Pretty decent condition, but non-working. Linear Power Supply and Main Board issue, otherwise the monitor and everything else works from what I can tell.
Quite nice, though, I don't think I would have paid that much for it. I only got $300 for mine fully working and in comparable condition. Still a good looking machine and its partially working, so that helps. Mine was free but I had to repair both the game PCB and monitor.
I think I just figured out what bugs me so much about this game. For an old Namco title it gets sort of dull after a while... but it has the COOLEST f'n sideart, ever.
Still a very fun game btw... but preferably in small doses.