Ever buy a Groupon coupon or deal of the day coupon and realize you'll never use it? You can always try to unload 'em on eBay or Craigslist.
Good news for all you well-intentioned impulse bargain shoppers: you're not alone. Now there are secondary websites specifically designed to sell your prepaid coupons and deals. Some sites charge a fee; others act as a Craigslist-style cyber-bulletin board. Take your pick. And be careful out there. A bargain's only a bargain if you needed it in the first place.
http://www.lifesta.com/ This site charges a fee based on the price of the coupon. They also have a moneyback guarantee if the coupon is fake or expired. It's simple to use.
http://www.dealsgoround.com/ This site charges a 10% fee but is otherwise similar to Lifesta.
http://couprecoup.com/ This site does not charge a fee, but it also doesn't offer a moneyback guarantee, so all sales are at your own risk.