If I'm not mistaken it pretty much the same airbrush for cake decoration as it would be for a person painting model cars or anything else. You just want to be certain to buy edible "paint" (I recommend Amerimist) and clean the airbrush with a food safe cleaner, such as Everclear (strong grain alcohol). I ordered mine from Amazon.com. Just searched for cake airbrush and found some in most any budget. I opted for a rather inexpensive model since this is just a hobby for me, but it works just fine!
I have a badger - it is just a regular model car type brush. Not specifically for cake. It works great for me. I also have a cheap $20 airbrush that came with my compressor and that works well, too. Actually, my badger is broken right now, so I am using the cheapo and it does just what I need. But, I don't airbrush pictures or flowers - I'm more of an airbrusher if I want a red tier or if I want luster dust on the cake. I love it.
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