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The initial investment for an airbrush may be expensive, but you can get a fairly nice beginner airbrush, Iwata Revolution CR for about US $70. then your air source is is dependant on how much you want to spend, 30-200 depending on what you want and what fits your needs.
This initial investment is a one time investment (unless you later upgrade to more refined airbrushes but it'll only be as much as twice the cost of the Revolution). In the long run, spray cans will cost more if you keep having to buy different colors, multiple spray cans, etc.
There's absolutely nothing wrong with spray cans, I started out with spray cans and hand brushing. There are quite a few tricks that you can do with spray cans as well. The only issue is that custom mixed colors are very limited, and a spray can cannot get as fine a spray pattern as an airbrush.
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