i believe ncpatrick has got some rip stop from Hancock Fabrics. i looked at what they had there one day but didn't buy any.
i think they had nylon rip stop but couldn't say for sure now.
seems like it was about $6 or $7 a yard.
What I have seen in Hancock and JoAnn stores around Atlanta has always been 1.9 oz rip stop nylon with DWR.