Ok here's the prices:
Delvies Plastics: 1/4" $101 per sheet (cast)
3/8" $149 per sheet (cast)
Regional Supply: 1/4" $76 per sheet (extruded), $112 (cast)
3/8" $119 per sheet (extruded), $161 (cast)
The salesman also said the extruded was a no-no when it comes to water. The extruded absorbes water and swells to the point that bonds can fail. Cast, in his opinion, is the only way to go. Any other places I should check with better prices?
Flaz, I like your skimmer, when I get around to making mine, I'd like to have a look at yours and have a little talk.