Try the yellow pages. Look under steel distributors and generally they will also carry aluminum. If not ask and they should know. You could also contact some of the local steel fabricators and ask them where they get materials. You can get it shipped from McMaster Carr. They carry a HUGE assortment of stuff including tubing. Here is the link.<br /><br /> http://www.mcmaster.com/ <br /><br />Are you sure you need 3/4" ? Most of the frames are made from 7/8" tubing.
