"How dumb do they think we are charging $X for that gun?""
"What idiot paid X for that gun?"
Hey, maybe it'll be collectable in the future. Maybe they're just happy to have it; it's not your money, what do you care? After all everybody is dumb in different ways. Maybe cheapness is yours.
A last one - "when was my gun born?". Guns are made, puppies are born.