I suggest passing on the gunshow.
Price of admission usually isn't worthwhile.
Stuff inside is overpriced, if you can find anything you want.
Selection is slim.
Cash in hand makes little difference.
If you find the item you want, theres only one in the whole show, it's beat up, it is about $300 overpriced, even if it were new in box, which it ain't, it would still be $300 overpriced... and you attempt to barter a little, and the dickhead running the table begins his loud announcement of "Are you kidding? Thats less than what i PAID for it, but sure.. so long as you pay my table rent, pay for my gas, an hourly rate for sitting here, etc... yeah matter of fact I think you're getting a hell of a deal. I'm not budging on that price!"
Then once he has everyone in the show looking at us...
He gets to keep it.
Yes, it's happened.
Gunshows around me just suck. It's hardly even an enjoyable waste of time, rather it's mostly depressing since I went to gunshows in the early 80s as a kid, and I remember what it used to be like.
I've purchased new guns online for less than used guns cost at shows, and I've never had a problem. If I was buying something used online, then I'd be ready to deal with the possibility that it's not quite perfect (cosmetic or mechanical) since the potential exists. You have to factor such things into the price, and then go based on the seller's reputation.
Therefore, I have no business at my local gunshows.
Your area shows may be different. At least, I hope they are.