Affirmative with Phil-A-Steen: Went to the Harrisburg show back in May---fanatastic, especially when compared with shows in my area (Westchester), which is, basically none any more. Lots of tables, plenty of ammo, AR's and AR stuff. Bought a five pack of those British steel AR mags for $19 each. (each mag that is, not the five!) I drove down and back in the same day by myself, which is a bit tiring. If you go with 2-3 guys you can share the driving, and then it's not so bad. Or, if you got the bucks, you can stay over.
There's a Hampton Inn about 2-3 miles from the Farm Show complex (show venue) that has nice rooms for about $80--$90 per night. H-burg is a cool little city as well. You can see a AAA ball game for, like $7, the Susequanha river's right there--nice place.