Hi, I want to buy a piece of frosted plexiglass (about 3'x4') to use as a background for studio shoots, and maybe as a diffusion panel for firing strobes through sometimes. I'll mainly use it as a background however, lit from behind. i.e. http://www.photo.net/photo/3264340 I'm located in Sacramento, CA, and when I went to my local plastic store they wanted $9.50 per square foot for 1/4" thickness, which came out to about $120.00. I'm a student and would really like to find it for less, and I found it hard to believe that it was that expensive. Are there any cheaper alternatives that are equally effective? Is this unusually expensive? Thanks for any advice.