Free: Contests & Raffles.
I go to lots of shows and lately I have seen no great deals, many times I can buy new for less than used at a show!!
Decide what you want, what condition, and what you are willing to pay before you go.
Look for guys walking around trying to sell stuff to the dealers. They want to unload those guns and expect a low price from dealers who are going ot mark them up for resale.