if you are any good with electronics find a charger for a cell phone ect and cut the cord and splice the ends to the fan.. make sure that it has the right voltage but prob 12v..
if not go to a local goodwill or salvage shop and buy a cheap fan there and scribe a hole to fit the fan.. and i would recoment it blowing out and cut a few holes to allow air in to replace the air you expell..