Sump Baffle Material?

[tinpusher]

I am turning a old 50 gallon into a sump/refugium. I am using a design found at the following link.

http://www.melevsreef.com/acrylics/sumps/f/sump_f.html

I phoned Industrial plastics and was quoted $25 per sq. foot cut to size for aquarium 1/2" acrylic. Is there a cheaper plastic that will serve the purpose. I don't need to see through it as the refugium viewing will be through the 50 gal. glass.

Thanks for all your help, this is a great forum

Doug
the question man