My favorite experience with a dumbass dealer was at a show about 6 -8 months ago. I went with a friend who wanted a Para 12.45 LDA like mine. I paid $550 for mine, with some miles on it. It's been a great gun. Anyway, we find one at one of the tables and it is really nice - LNIB, may not even have been fired. Guy wants $620. I tell my buddy to offer him $600 cash, which IMO is a fair price (given that I am usually allergic to paying the asking price for used mdse).
You'd'a thought my friend had said "Can I bang you wife in the pooper? Will you lick me clean?" The guy was downright hostile. "NO! 620! NOT A PENNY LESS!"
I asked the dealer "You do realize that that's about a 3% discount, and he's paying cash, don't you?" He just stared. Big, fat bastard. Made me look slender and clean-cut. I said, "Well, you're gonna burn more than $20 worth of pork rinds hauling it back to the truck."
I tried to get my friend to go back at closing time on Saturday and offer $550; noon Sunday...500; 4 PM Sunday 425...but he wouldn't do it.
The punch line is that I've seen the dealer at 2 shows since then, one just about 2 weeks ago, and he still has the same gun with the same price tag sitting on his table. I hope they throw it in his coffin.