We have an American Airlines travel voucher that must be used by November 11, 2012. It is worth $250 off any regular ticket - it cannot be used for upgrades - etc. We received it from a flight and forgot about it until now. It is transferable to anyone. You can use it for booking online - we can give you the serial number and secret code. Asking $200.
Note added - October 11, 2012 - I put the coupon on craigslist - and a Emily from San Diego bought it for $175.