Please note that the original date on this thread is back in 2006.

13 oz Poly/Cotton Twill is fairly easy to find. Think a little heavier than "Dockers" pants. ("oh no, Steve said a naughty word".)

Carr Textiles
Fenton,MO

A large jobber that sells mostly to big manufacturers in bolts of fabric of 150-1000 yards at a time.

But if you can use up 50-75 yards they will usually cut you off that much for an extra fee.