I went to this auction in Beleville (outside St. Louis) a couple months ago:
http://www.superauctions.com/there is another one on October 29, 2005 that I am going to
At the last one, there were about:
40 fruit machines
30 Pinball - new and mechanical
125+ uprights
10 driver/cockpit models
20 cocktail models.
A few of those wierd walmart/car/kid rides things. There even was a change machine.
Games were basically from galaga, pacman, to hydra, lethal forces. I should have taken my camera but did not know what to expect. The prices were great. A D*mned working T-MEK 2 -player cockpit sold for $550.
The highest prices were the cocktail models, especially ms pac man - one went for around $500. the uprights all basically sold for $200 - $350. They were all turned on prior to the auction, and on free-play, so you could play and inspect the games.
I'll be the only one there takin pictures this time, but will post soon after. I'll throw some low bids out to see what happens.