This guy I know got some ammo for his minty Spencer carbine. Apparently it wasn't accurate but fun to shoot. When he bought it the seller said $1,200. My friend said I'll take it and met the guy as fast as he could. Couple days later the seller called him back demanding more money because he said my friend knew it was worth more. Seems the seller researched it AFTER selling it. After the annoying demands, my friend told the guy "tough feces, you came up with the price" and that was that. The moral of the story, of course, is value your gun BEFORE selling it. Duh!