Good to hear that your 150 is working as it should. I'm also a proud owner of one, and they are terrific all round airbrushes.
Do get a compressor! Canned air doesn't last too long (as you've found out) and is rife with problems in the first place. Uneven air pressure, freezing problems, and they are quite expensive to boot.
One idea for the interim is to buy a truck inner tube and have it filled at the local garage. The air is free, contains more air than a can, and is refillable. You might get some odd looks from the neighbors, but I'm used to that!
Meanwhile research which compressor is right for your use. One excellent source is
Dixie Art. I don't know where you bought your airbrush from, but if it wasn't from Dixie Art, then you likely paid too much.
Good Luck!