I accidentally stumbled upon this innovative site, SwapTree.com, when I was exploring Swagbucks.com. I think this two sites are connected some way or another. 

So, what is SwapTree? SwapTree "take the old stuff that's collecting dust around your home and we give it to someone else. In return you get something of theirs." According to information provided in the About page of the site, there is no bidding or exchange of money. The great thing about this site is participation is totally free and it helps our environment by not going into wastelands.  They are put to used for other people to enjoy. I have yet to swap or trade on the site. I have not yet found things to swap. Note, they only allow books, music CDs,  video games, DVDs, and movies to be swapped or traded. The only thing you have to worry is the shipping cost. The site makes money by providing shipping to you online. Saving you gas money going to the post office.

I also looked the rating Better Business Bureau gave. They gave an A grade to SwapTree. BBB accredited them too. BBB processed a total of complaints about this business in the last 36 months.13 of the 19 complaints were closed after 12 months. The remaining 6 were resolved. -BBB

So, gather your old books, music CDs, video games, DVDs, and movies and go swap and trade with SwapTree.