I went to a gun show this weekend too, in Detroit Lakes, MN, a resort area about an hour east of Fargo. Admission was $3, and was held in a NG Armory with really cool vehicles in the chained and barbed wired lot outside. Show was very well attended.
Mostly no ammo, other than collector items. One seller had limited ammo - $50/100 round Federal FMJ boxes (and yes, I bought 2), no .308, no .45ACP, and only Wolf 9mm. One dealer had 1 - count 'em 1 - .50 cal ammo can, which I got. One dealer (getting the point - these were all different dealers, but onesies, not a bunch) - had 5 boxes of small rifle primers, refused to sell them to me as he "had not priced them yet" - and when I went back about 15 minutes later he had already sold all 5 to one buyer for $5 a box.
Smattering of pistols, maybe 20 all told, evenly split between semi-autos and revolvers. Mostly shotguns and bolt-action rifles, only 4 AR uppers, no full rifles. The uppers were priced at $475 each, mix of M4 and A1. If you wanted the bolt carrier and charging handle, that brought the price to $600.