When this happens to me, I tell the seller to list it on ebaY with our agreed upon price as the Buy It Now price and let me know what the auction number is. I tell them that I won't be salty if somebody else gets to it before I do but regardless they still get their end of the deal. That way I get to check out who they are, feedback, etc. I've done this several times with absolutely no response. Nada. Zilch.