"I got a buy offer for $275 today. I made a deal with you first, so I would still offer you that same deal, but otherwise I will take that deal. That would be an even swap with your asking of $275."
I told him that I would have to give him a Negative feedback, he said:
"You do what you have to, but if someone was offering you 30% more, that would be silly not to take that. In respect for our original deal, I did come back to you and offered you the exact same thing. You decided you did not want that, which is fine and your choice. Welcome to capitalism."
Then felt he has to tell me:
"Boy are you going to be upset on Friday then when I don't show up. I'm not selling to you for less money when I don't have to. Tell mom on me if you feel you must, but I will not be there."