I think you can just buy a 12 volt computer fan then splice the wires with an AC adapter as long as the AC adapter has an input of 120V and an output of 12V. Pretty easy, should only take you a couple of minutes. If you want to spend more you can definately get some off of ebay, but they're much more expensive than the setup I just mentioned. I'm pretty sure that works, but you may want to wait for the experts' advice before you go burning out a computer fan =/