I have a suggestion. I have a small compressor from Harbor Freight that I was able to buy on sale for $40 that should be more than enough for a badger air brush. It also handles a small pnumatic 'nail gun' (only shoots 1" x 18gage nails), etc. http://www.harborfreight.com/3-gallo...sor-95275.html
. I think that this might even be overkill for an air brush, but you can always use it when you need compressed air to 'clean' something off, etc. It won't do anything heavy duty, or even medium duty, for that matter. But it works well enough.
Whatever you buy, make sure that you get a water separator for your spray gun setup.
I bought this compressor to do some spraying with a small touch-up HVLP setup, but in retrospect, I don't know if this will provide enough capacity or not, it might be too small for that. Any comments from anyone?
Anyway, for your application, I'd recommend the Harbor Freight compressor for light duty work. Look for their ads in various modeling and woodworking magazines. You can get some deals, but beware, their stuff is not exactly top shelf. But in many cases it's 'good enough'. Caveat Emptor.
Just my $.02