If you are look for websites try some of these.

C & D Jarnagin Company
http://www.jarnaginco.com/revwarframe.html
G. Gedney Godwin
http://www.gggodwin.com/default.asp
Stuart Lilie Saddlery
http://www.stuartliliesaddles.com/index.htm
Wilde Weavery
http://www.wildeweavery.com/Default.htm

Just a few places that I know sell the packs I think you are looking for.