Anyone knows where I can buy supplex ripstop nylon?

Rockywoods have some but none of the colors seem suitable for pants..

I came across this interesting article:
http://www.pitt.edu/~kconover/ftp/Clothing Materials.pdf

"Ripstop supplex" seems better the supplex in comfortable against skin, abrasion resistance, wicking and sweaty comfort, thorn-pull resistance and Wrinkle resistance.

You can find some for $3.25/yd here: http://therainshed.com/

Go to the "Sale Corner" and scroll down until you see it. This is coated material however, not sure if that's what you want, but there it is.