Just in case anyone is interested Fry's has 4 computer fans for $6 with a $6 mail in rebate making them free once you get your rebate back.
http://www.frys.com/search?plusearch=7551736 7551766 7551656 7551686&site:P103_THU&date=112813
http://www.frys.com/search?plusearch=7551736 7551766 7551656 7551686&site:P103_THU&date=112813