Mike, the economics of custom knife buying are entirely different from production knives. There really is no such thing as a 'wholesale' price. You are paying for a makers time, experience, knowledge and reputation. Most custom knives have an asking price. That is not different at a show.
Most custom knife dealers sell knives for near the makers normal price. Obviously the dealer is getting a price break, but this pays the maker back in advertising by exposing his work to a larger knife buying market.
The best thing you can do before the show is to decide on first, the style of knife you are most interested in. Fixed or folder? working knife or fancy folder? natural handles or synthetics? Once you know sort of know what you want, try to select a few makers who make that style of knife. Look at
www.knifeart.com and
www.arizonacustomknives.com and
www.robertsoncustomcutlery.com and
www.bladegallery.com and
www.nordicknives.com
Here is where it gets tricky.
The work of all makers is not equivalent in price Or quality. Some are better than others. Some relatively new makers produce a very exceptional product for much less money than others. And some new makers with a relatively poorly made product charge just as much as long time, established and credentialed makers with an outstanding history of work.
I suggest you try to select one to three makers who produce the kind of thing you are looking for. Look them over. Ask LOTS of questions. Makers love it when they know that their customer is actually interested in Using their knives.
Buy what you like and you will never be dissapointed. I never buy knives thinking about their potential return as investments. The stock market does much better than knives. Searching for the Perfect knife is most of the fun. The quest will never end.
Welcome to the world of customs!
Please look at this recent thread in the custom forum on Haggling at knifeshows:
http://www.bladeforums.com/ubb/Forum4/HTML/001288.html
Paracelsus
My custom knives:
http://albums.photopoint.com/j/AlbumIndex?u=953840&a=6978796