Thanks to Money Saving Mom for posting about this new service!
"When you sign up with Swap-a-DVD, you post 10 DVDs you already own and would like to pass on to someone else. After you have completed that, you are given 1 free DVD credit which you can use to request one of any of the DVDs in their system. Then, when anyone requests any of your ten DVDs and you ship them out and the receiver notes that they have been received, you get an additional DVD credit for each DVD you ship out. You can continue shipping and listing DVDs like this and then choosing DVDs to have shipped to you. You only pay postage on the DVDs you ship out."