I've found a few here that are appropriate for garage use. The Honeywell 500 CFM Indoor Portable Evaporative Cooler for Rooms up to 300 SqFt for $279.99 will probably be adequate for my garage.

The evaporative cooling market consists of established players and innovative newcomers clashing for market share. Traditional brands like Honeywell and Munters face off against agile startups like ...