What you are seeing at gun shows is production knives. There are also custom knives, hand made knives and Knives made by Master Smiths.
Obviously the prices range from reasonable to amazingly expensive.
Inexpensive, mass produced, commercially available Damascus came onto the scene around 1980 and opened up a now world for folks that would never spend the money for hand made Damascus.
How dense the Damascus is varies the price greatly. 24 layer steel is much cheaper to make than 1400 layers of steel.
A Master Smith might take 3 weeks to make the billet of tightly folded Damascus for his project.
What are the scales, liners and rest of the knife constructed of? That also alters price dramatically.
I can not help on the low end stuff, but if you are ever interested in some of the top shelf knives drop me a note.
http://smith-wessonforum.com/lounge/318729-2013-blade-pictures-added-not-56k-friendly.html
My For Sale site is BladeBuzz.Com I am adding to it as fast as I can, right now it has less than 10% of the inventory on it.