Saving Money on DVDs (and Videos)
Great places to buy used CDs and DVDs are your local thrift store where they are sold frequently for less than the cost of a rental. When you get done with them you can always donate them back of sell them online here: http://sellit2us.com/
Sell Your Old Books Online
I think that when you decide to sell your books online you should get quotes from a number of book buyback sites.