Actually, the Davis show in H-burg is getting to be a much better gunshow. Used to be alot more militaria-focused, but not really the case any longer. I'd say the last few easily rivaled, if not surpassed, Valley Forge for the number of firearms and related accessories. Not to mention the venue is much bigger, so you actually have room to move.
The allentown show at the PA expo center pretty much sucks, but I'm almost certain there is no parking fee. IIRC, the admission is $8, which is pricey. The show at the fairgrounds is getting a bit better. Also used to be mostly C&R & antique guns, and militaria, but some more modern stuff gradually creeping in there.
I'd agree with the assessment on the York, Lebanon, and Leesport shows. I try to make most of these, if for no other reason as some weekend entertainment. Not sure I'd drive all the way from NJ for them though.
Rocko