Craig Colvin has written an excellent FAQ on dimming a laptop screen, at http://observers.org/tac.mailing.list/2003/May/0023.html

From Sander... Sorry, TAP Plastics. http://www.tapplastics.com . Stores around the Bay Area. Good source for all kinds of plastic goods like red acetate, acrylic sheet cut to size, little boxes and bottles etc. I once built an underwater housing my DV cam and had them cut the components. Worked like a charm. Bummer that I can’t dive anymore but at least I now have a hobby that’s even more expensive than scuba :)

From Phil...

TAP Plastics, is a chain of stores that sell various forms of plastic. There happens to be one right in the middle of downtown Mountain View.

They have a red acrylic that is perfect for laptop screens, among other things.

There are a bunch in the area, from this list.

TAP Plastics has 20 locations throughout the United States. Dublin, CA El Cerrito, CA Fremont, CA Mountain View, CA Pleasant Hill, CA Sacramento, CA: Auburn Sacramento, CA: Florin San Francisco, CA San Jose, CA: Blossom Hill San Jose, CA: The Alameda San Leandro, CA San Mateo, CA San Rafael, CA Santa Rosa, CA Stockton, CA TAP Custom Fabrication Portland, OR Tigard, OR Bellevue, WA Seattle, WA