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12 volt DC adapter, and wire the fans in parallel.
You could use a 12v battery...
LOL I have been telling people this on the 360 board and I get flamed everytime. rat shack has a selectable transformer, that will supply any voltage you need. they also have a switch with a power plug on it that can be nicely mounted on the back of the 360 and you just plug in the transformer like any other plug..I personally think this is a great idea.