Hello:  I have bought brass from McMurray Metals Company in Dallas,
Texas, on occasion when I needed it.  I have not bought tubing or
priced it but the other brass I have bought seemed reasonable at
the time.  Their web site is http://www.mcmurraymetals.com/ 

They also have babbit that I buy and use on the bearings on the
carousel at the State Fair of Texas.  Hope this helps.

Kary Barnett
Amarillo, Texas