I could see if JoANN fabrics has purple.... I dont think they do, but if they do, I could proabably make one to your specs. I would reccomend Topflight or something, though. I dont think I have ever seen purple where I get my ripstop. Why do you want purple, if I may inquire? Red is quite nice, and shows up exelent against any sky. PML makes purple/white chutes. ONe panele white, 1 panel purple ETC. I pretty much sell my chutes at CMASS, thats where people actually notice me. I fly a rocket with one in it, I get a small crowd by my range blanked and I make a few good bucks, and get the pleasure of seeing happy people recovering rockets with my chutes! Win-win!
Topflight is good, though. And they have prices just over mine (or just below, I forget....) B2 rocketry also makes em, and I hear a lot of good comments about Spherachutes.