I got a postcard in the mail - I went to one just about a year ago (they run these twice a year).
The auction is put on my "Amusement Auction Company." For information, call Tom at 515-360-7282. They charge a 10% buyer's fee, cash or "good check" only (I don't know how they handle approval on checks).
This is March 18th for the buy it now, the 19th for the actual auction.
The one I went to last year was a dissapointment...lots of shill bidding, and the auctioneer lying about the multicades being legitimately licensed (they were the standard 60-in-1s, new, but with rather awful looking marquees).
I read it was a dissapointment in the fall last year, as well (I didn't go after wasting the drive from Omaha the first time...all I ended up with was an 8-liner cabinet with a good 19" Wells monitor in it).