If you have a Menards or other Home Improvement store in your area, there is a product from Parkland Plastics. It comes in a 4ft x 8ft x 5/16" thick piece. Lots of people over on AVS use this as a screen and the company is now thinking about making custom sizes that can be ordered. With this size you get a 2:1 ratio screen, which is fine you just have to use your zoom for 16:9 and 2.35 material. Or, you could cut it down a bit for 16:9 to match the projectors native ratio.
The sheets run about $30 or less per sheet. Hang it on the wall, and your done, instant screen. Or you could get fancy and make a black felt/velvet boarder around it...
