[Porsche-O-Phile]

This is why you never promise anything when it comes to selling stuff - simple rule: you show up with money and you leave with the goods. If you don't, you don't. No holding stuff for later, no games. No ticky no laundry. As a seller if you promise to hold something I'll guarantee you get a better offer five minutes later. Why put yourself in that position? Don't make promises and tell everyone the same things - (1) the price is $X - don't bother lowballing me because I don't take kindly to time-wasting morons and (2) payment in full or nothing.

Two very simple rules that prevent a lot of headaches.