Cost of an item sold varies according to the buyer.

I just bought a sporting clays gun for my son. Saw the gun when we were grouped up with a gentleman by chance and bought a gun he was shooting that wasn't even for sale. Neither of us knew what it was worth but I made what I thought was a fair offer. He pointed at my boy and asked "is it for him?" I told him it was indeed and he said he would accept my offer.

CHAZ