Check this out ive done this to 3 pc fans...easy,cheap, and works great!I was wondering how ppl get computer fans to plug directly into an outlet b/c mine has some weird computer plug and it wont work unless its plugged directly into the computer.
Or just find any 12 volt dc adapter and splich the wires and connect them with electric tape...so cheap and takes less than 2 minutes (I found a bunch of old adapter around the house and fixed them up) So if you dont want to register on ebay then yaPC fans run on 12v
you need a 12v DC adapter to run them from the mains
one of these things
http://cgi.ebay.com/AC-DC-adaptor-regulated-output-3-12V-300mA-100-240V_W0QQitemZ160315659347QQcmdZViewItemQQptZPCA_Cables_Adapters?hash=item160315659347&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A0|293%3A1|294%3A50