Ah the South Jersey expo auctions... I went to the last one they had last season back in May(I didn't know it was the last one when I went). Funny thing is I stumbled upon it after looking around the internet for 'arcade auctions', turns out it was in 2 days, and I was living in New Brunswick, NJ at the time.....so I went to check it out.
My newbie, unbiased impressions: pretty long and tedious, with occasional happenings. I, of course, was driving my little sedan, so buying anything was out - but they did have lots of parts and such. Lots of things like boxes of as-is junk/parts or huge boxes of like 50 coin doors. They even sold a laserdisc for around 15 bucks, this was before I discovered daphne and to keep from kicking myself constantly I picture all the laserrot it has
it has laserrot it has laserrot it has laserrot(nobody knew which disc it was or what kind of shape it was in).
They had TONS of standup games and quite a few pins, too. Though I will say this: if you want a cab, and if it's anything like the one I went to, plan to stay the whoooole day. It opened at like 9 or so and I left at 1pm before they even started selling cabs. They were still auctioning off little stuff when I left. Oh and bring a 50ft extension cord to test out any machine you may want. It was 10$ if you wanted to bid, free to observe. Hot dogs weren't bad.
Sorry I can't say how the coin-op games faired, I had to get home and was tired of waiting for the good action. Good luck if you go and let us all know what you pick up!