jesus.. I never thought it would be so hard to find some damn aluminum piping.. I only need about 2 feet total to frabricate some new pieces for the air injection on my headers.. the stock stuff was like 1/2" or 9/16".. copper is no good cuz you can't really paint it.. stainless is too hard to bend and stuff..

 

Try a search for McMaster Carr. Search them for tubing, not pipe. they'll have it. There's other industrial supply shops as well that slip my mind right now.

Or look in your Yellow pages for tubing suppliers.

Don't A/C shops use Al. tubing for condensors? Could be another lead, not sure.