A lot depends on location. You may have to drop the 8 bucks once just to see if you have dealers who actually compete for prices or if you have one of those groups who have agreements on price fixing before the show even starts.
One of the best shows I used to go to took up two and a half good sized buildings at a state fairgrounds. There were enough vendors to force some competition. Saturday, early was the time to go to get deals on guns, and late on Sunday was the time if you wanted to hit up the bulk ammo vendors, who didn't like loading up unsold crates of ammo late on a Sunday afternoon.
I've been to other shows where everything but the beef jerky was overpriced. (All I left with was some beef jerky). So, go knowing what you have in mind to buy, and what fair value is, and what you are willing to spend. No one is going to twist your arm and make you buy, but if you get impatient and tehn find out later how much cheaper you could have gotten it, you will really begin to understand buyer's remorse.
Also beware of the gunshow vendors who are unloading garbage that they couldn't sell in thier store. Afriend of mine bought some 5.56 green tip ammo, when it was getting hard to find. It was a low price for the market. I just didn't have a good feeling about the folks selling it.
It turns out it was reloads, that caused him more stuck cases, and jams, and popped primers than even the worst reputationed 3rd world surplus ammo.
So, buyer beware applies.