I use a Propane Tank (like on bbk)
I put 100psi but I can go more..
cheap solution, quiet while you are working (you fill the tank before) and 100psi il ok for 1 or 2 model..
get a cheap compressor for tire (15$) and some adaptor to get fit the airbrush with the tank and it's done...
oh and you need an air regulator (or you will get 100psi... a bit too much for painting hahaha).. 15$