I was there. Tried to keep an eye out for prices, but I failed to pay proper attention due to starvation mixed with talking to too many people.
I picked up Metal Slug 6 with a VGA monitor.
http://img.photobucket.com/albums/v223/the7k/IMG_20111203_161236.jpg
Will likely take MS6 out and put in either MvC2 or CvS2, considering the panel is more than right for such a thing. Was also watching a MvC1 in a similar cab ($150, I believe) and a XvSF in a very manly cab with a trapezoidal control panel ($225). Both were nice, but they each had issues with their monitors.
Of my friends, one picked up Lost World: Jurassic Park (with new guns) for $400, Super Mario Bros pinball for $900 and sold his Rocky & Bullwinkle pinball for $1350 (he also picked up OutRun 2 SP, but I forgot how much he paid). Another got into a bid war for a Sega Blast City that was sporting some fishing game for $300+. Another picked up a 'meh-but-it-works' 1-slot Neo Geo w/ Bust-A-Move for $120, and yet another got a non-working stand-up Virtua Racing for $10.
I also heard about a non-working Crisis Zone going for $5 and a non-working Silent Scope also going for sub-$20. Even with them not working, I'd probably have tried my luck at getting these and embarrass myself at attempting to repair them - for $5, why the hell not?