Welcome to GT Reality man!
lonewolfdist.com has a wide variety, and prices are decent. They ship pretty quickly too. They sell RSAs, but they also sell springs separately. If you buy just the spring, you'll need to get a guide rod too.
I have a Wolff 22# spring (non-captured) and steel guide rod. It does not perform too reliably with hot (factory or handloaded) ammo. I get best results with the stock RSA.
"There is nothing like looking, if you want to find something." Thorin Oakenshield
Last edited by Taterhead; 01-13-2013 at 22:29..