It's probably been four years since I've been, but I have seen several good guns at the big Louisville Gun Show. The last one I went to, I could have bought a late Moll rifle that the guy had $2100 on. I had $1900 on me (more than I probably have ever had at one time before...or since) and almost offered it to him. The gun was sanded down, but not too badly, and had definite remnants of painted on curl. I have seen a really nice GOOD condition plain Lehigh gun of the Rupp/Kuntz variety, $3500, a super condition eastern Berks county gun with red varnish for about the same (In fact, I am still not convinced that this was an old gun, but maybe a Kettenburg gun...the dealer was either busy, or not at the table when I was looking at it, and didn't ask). A signed Andrew Kopp, fully relief carved, not sanded down, but well worn. Old blackened varnish, barrel cut down and per-cussed. $1900. A signed Zorger fowling gun, rather plain, and HEAVILY sanded down, you could barely see a little carving around the nose of the comb, $1600. A fine Hess-type gun (unsigned) for $3,000. etc.
I also have seen one nice big Hudson Valley fowler priced at $10,600. Rather early, and apparently maple stocked. Iron mounted, and frankly, I wondered even at the time if it was actually made in New York, or in Holland... By the way, unless you have actually seen one of these things first hand, you cannot grasp the absolute magnitude of the mass of such a gun. Pictures cannot relay just how huge the buttplate is...
My little plain cherry fullstocked New England rifle cost me $875 including shipping from John Gunderson. He often has some nicer ones with wirework in the $1200 range. I think right now he has a heavy Berks county bench rifle...
German guns are cheaper, naturally. My nicest one cost me $850, though I think normally it would sell for at least $1500, considering that it is in original flint. Most normal grade German guns and rifles I see (usually converted) are in the $1200 range. I saw a nice Wender, super nice, but not pristine, at the last show, and the guy had $7000 on it.
If I see a gun that does not have a price tag, I do NOT ask. If there's no price, they obviously don't want to sell it.