My garage is peaked and has a gabel vent, gabel fan and wood stove. Once the wood stove warms the room up the fan kicks on. Come Jan/Feb I'll start the stove an hour or two before I go out so it's toasty and the fan is already running.

If you have a gabel vent adding a fan will be less than a 75 bucks. You can probably hardwire it to a standard light switch bypassing the thermistat. That way, just flick it on and you're good.

Another idea is if your state has banned smoking in Bars and such you might be able to pick up a old smoke eater on the cheap. With the economy the way it is, I'm sure some owner would take less than its worth.