My mother-in-law took me to this fabric store called SR Harris and it is amazing! they have just about everything you could want including ripstop nylon (coated and uncoated), gortex, fleece, and so so so much more! the prices marked aren't actually the prices (everything is always 50% off) they also have zippers, webbing and as I said before... so much more!
http://www.srharrisfabric.com/