Badger has a clearance or "garage sale" page on their website where they will sell airbrushes with cosmetic defects at HIGHLY discounted prices. Maybe you can find something you like there?
badgerairbrush.com/Garage_Sale.asp
I have a feeling they haven't updated their website in quite a while, so you may want to call first to verify those airbrushes and prices are still available. Also, I've had terrible luck getting them to communicate with me when I sent my brush in for service, so be aware they may be hard as hell to get hold of.
Another option I'll throw out there are the cheapy airbrushes you can get at Harbor Freight tools. These are single action, siphon feed external mix brushes. While my Badger was in for service, I picked one of these up to get me by -- it was $15.00. It actually impressed me very much considering the price and the fact it's a cheapy Made In China rig. The only down sides I saw to it was that it consumes a huge volume of air compared to my Badger (I run off a compressed air tank) and the seals inside will not tolerate the hotter paints such as those that are lacquer based. I used Model Master Acryls in mine with no issues. Overall though, for the price I was very impressed with this brush and have knocked out three models so far just using this brush alone.
anyway, those are my thoughts. Hope this helps.
Chris