I'm having a hard time finding threaded tube inserts online. What I'm looking for are these:

http://www.meridiantelescopes.com/inserts.htm

...except that I only need 8, not a package of 50.

Obsession has them for $3 each, but they don't list the tube wall and you have to mail a check because they don't take card payments online. Argh.

All I need is 8 threaded inserts that will fit 1" OD aluminum tube with a 0.05" wall.

Where else can I find them?