Alex wrote:

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.

Cole Fox Hardware on 4th Street, has small square tubing in Aluminum and Brass.
It is in the basement in a section where they have a bunch of small dimensioned
tubung, rod and sheet for hobby supplies.

Another source is Small Parts in Florida, (http://www.smallparts.com)
800-220-4242 I buy stainless steel tube from them regularly.

They have a very large selection of small tubing. They carry telescoping square
Aluminum from 3/32" to 1/4", and square telescoping Brass from 1/16" to 1/4" and
in thin and heavy walls from 1/4" to 3/4"
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Abrasha
http://www.abrasha.com