Yeah, that's a good one to have. I did a stupid and missed out on one at a gunshow a couple of years ago. I had not seen one in a while and the old guy at a table next to me had one in his pistol display case for 3 bills. Fair for a buyer, but not so much for a cheapo gun trader like me.
I had the second table to the right from the front door, so I was getting some guns comming in the door cheap. The old guy next to me had bought about 4 handguns by lunch time and said he was tapped out on cash. I had bought a Ruger Stainless target for 2 bills and an Egyptian AK for 2 and a quarter, so I was almost tapped out on my budget for the weekend. but feeling pretty good with what I got. By Saturday after lunch, the old guy pulled out the Stainless Old Army and offered it to me for 2 bills. I still had enough to get it, but passed it. He still had it on Sunday and came down to 150 on it. I had sold a few clunkers and was gong home with the ones Ihad picked up. I was tempted, but a guy came in with a nice Ruger Sec. Six for 2 bills. and I bought that instead. He finally went and sold it to another gun trader friend of his for 150 to get some traveling home $. Later, I kicked myself in the azz for passing it up.