Dazian Fabric sells both non-perforated and perforated screen material in widths large enough for your screen. These are a bit expensive for my tastes, so I'm using their Coated Celtic Cloth, which comes extremely wide if need be (up to 160" at least!). However, this material is more intended for speakers behind the screen, and as such also lets light through. You can back it with a non transparent material such as Dazian's Commando Cloth if you like and still come out way cheaper than the genuine screen material. I have no complaints using the CCC, but my setup required it due to the speaker behind the screen.
I've heard plenty of good comments over at AVS forum in regards to the material on eBay sold by the seller moakes.
http://www.dazian.com
Aaron Gilbert