At Radio Shack they sell 12v AC to DC converters. You have to make sure you get one with enough milli-amps. The chargers are a universal wall charger and you buy the tip you need. But you don't need the tip so cut it off and wire it to the fan.
I found them on the website. Something like this
http://www.radioshack.com/product/in...entPage=search
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