I found this part of the Amazon Agreement and I think it looks like they have to honor our transactions....
8. Your Transactions
a. For sales where a Seller lists goods at a fixed price ("fixed price sales"), the Seller is obligated to sell the goods at the listed price to Buyers who meet the Seller's terms. By listing an item in a fixed price sale or by auction, you represent and warrant to prospective Buyers that you have the right and ability to sell, and that the listing is accurate, current, and complete and is not misleading or otherwise deceptive.
b. For auctions, unless a Seller specifies a "reserve price," all auction items are "without reserve," i.e., the Seller must sell the auctioned item to the highest bidder that meets or exceeds the minimum price. If a Seller sets an undisclosed "reserve price," the Seller is not obligated to sell unless the reserve price is met or exceeded. Once the auction closes, the Seller is obligated to complete the transaction.
c. For fixed price sales, Seller will determine the purchase price for each item he or she lists on the Site via and subject to Amazon.com's standard functionality for listing the purchase price; provided, that Seller must abide by the same procedures and guidelines contained in the Help section with respect to pricing.
9. Your Obligation. By entering into this Participation Agreement and posting a listing for auction or fixed price sale, you agree to complete the transaction as described by this Participation Agreement. You acknowledge that by not fulfilling these obligations, your action or inaction may be legally actionable.
10. Sales, Use, or Similar Taxes. You agree that it is the Seller's and the Buyer's responsibility to determine whether sales, use, or similar taxes apply to the transactions and to collect, report, and remit the correct tax to the appropriate tax authority. You also agree that Amazon is not obligated to determine whether sales, use, or similar taxes apply and is not responsible to collect, report, or remit any sales, use, or similar taxes arising from any transaction.
11. Refund Obligation. Sellers must provide a full refund via Amazon to any Buyer who remits payment, whether the Buyer paid directly or through Amazon, if the item cannot be shipped at the close of the sale. Seller must provide the refund promptly, but in no case later than thirty (30) days following the close of the sale. Any Buyer who believes he/she may be entitled to a refund on this basis can contact the Seller directly.