You could contact some large aluminum manufacturer, they exist also smaller
but are not always in the catalogs.

What is the application?

Round tubes I have found very small in applications for the medical sector.
(But also rather expensive)
Timothy

"Alex" schreef in bericht
.com...
I am looking for source(online or otherwise) small(less than 1/2") steel
or
aluminum square tubing.
The smallest tubing most sources have is 1/2" which is too much for my
application.

BTW: I am in San Francisco Bay Area.