Airbrush newbie needs technical know-how, please!

Hmmm, build your own. Go to a hardware store/dept like at Lowes or Home Depot and pick one up, in line for a buck or two. You may not even need one especialy if you have a tank with your system. A tank is a nice thing to have, it will help smooth out pressure fluctuations, cause moisture to drop out and lighten the load on your compressor. You can get a five gallon tank at Western Auto for around $20.00 - a very good investment. If you are not in a high humidity area you may not need one, I live by Lake Erie and have been airbushing here for 12 years and do not have one (I use an expansion tank).