You should sell your keyboard on eBay. You'll probably get more for it. I sold a 18 month PSR740 that I used every day for $780 plus shipping throwing in some styles which were free for me and a midi cable. Some people on eBay don't know where the best deal is. I sold my other 10 month old PSR740 for $650 plus shipping and that one had seen a lot of use too. After I got $780 for the other one, I was sorry I didn't put the newer PSR on eBay.
So if you don't have any buyers yet, I would consider revoking your offer and selling it on Ebay.

Larry