I saw your comment about gift cards on DIZZYBRITCHES blog. There are places online where you can sell gift cards you aren't likely to use. I don't believe you get full face value, but you can check it out and shop around for the best deal.
Also, if you know someone that shops at that business, you can regift it, or if they aren't on your gifting list, maybe they would buy it.
Another option would be to donate it to a charity -- they often have raffles or auction fund raisers where they could use it.