Where is this particular show?
The few gun shows I've gone to in the last decade were mostly licensed dealers with no better pricing than the stores in town. But you will get a selection of just about everything that is on the market.
If you know what you want, just buy on the Internet and ship to a local transferring dealer. Otherwise, it's best to form a good relationship with a local store like Wild West Guns, pay a little bit extra, and have awesome customer service forever.