Got unwanted items lying around?

Ship them off to a used goods exchanger, such as Gazelle (in the U.S.) or SpeedSell (in the U.K.)  (SpeedSell will even drop by and do a pick up).

Both provide compensation for the items in the form of PayPal, which you can then use to buy Bitcoins on CoinPal.

http://www.Gazelle.com
http://www.SpeedSell.co.uk
http://CoinPal.ndrix.com

Thanks to noagendamarket for pointing out these offerings:
  http://bitcoin.witcoin.com/p/269#r-461

I used the Comments form to provide feedback to Gazelle asking them to add Bitcoin as one of the methods they use to pay for the goods.