Hi .. I seem to recall trying that once and price cannot be discounted. Could have asked him to bid and then ended the listing to sell.
Buyer , if they would agree, could pay invoice and then issue a refund through PayPal. If not , cancel the transaction and set up a correct BIN for the buyer. Use his ID as title and send the item #.
http://pages.ebay.ca/help/sell/cancel-transaction-process.html