Where to get stainless tubing?

I'm looking for 1/2" and 3/8" tubing and I can find aluminized fuel lines all day long, but can't seem to find stainless lines so I can run new hard lines under the car. Anybody know where to get some? How durable are aluminized lines? I'm worried that being exposed to the elements will cause them to eventually leak.

Thanks!

These guys will have what you are looking for:

http://www.mcmaster.com/

or,

Jeff @ Fowler Engines also carries S.S. tubing. Here's a link:

http://www.fowlerengines.com/

Try these guys.... they have a lot of automotive oriented parts and pieces:

http://www.chassisshop.com/