Just thought I'd throw it out there since this is a group out of NY State and unless you read the local paper you might miss it.  It's a smaller show, I'm guessing 100 tables, but there is always something interesting there.  Be aware there is also a show in Jeffersonville, OH so pay attention.

It's located in the Expo (4-H) building at the east end of the Ashtabula Co. Fair Grounds.  I'm not sure of the address but it's on the Elm St side.


ETA Info on bottom of this page:
http://www.yorkpennshows.com/shows/

I think the 150 tables listed might be a bit high, but they were looking at moving some items normally stored in the building outside for the show.

Depends on what you're looking for.  I've never seen much in the way of bulk ammo, but I usually find something that doesn't seem to show up at the Ohio based promoters shows.

ETA: if nothing else you could visit Golden Dawn, it's a true ATF store.  The gun shop is up the stairs in the far back right-hand corner of the store, just past the produce section.

County owned building.

Yet I can buy or bring a firearm in the building today and tomorrow?

That guy is here walking a couple of Glocks.