I've shopped at: Plumbateria. Western Pool and Spa. Industrial Paints and Plastics.
I know others have shopped at (and I will check them out when I'm next in need): Acrylic Concepts. GE Polymers and Shapes.
I know there are a couple other suppliers but I can't think of them. I've gotten glass at some window shop. Probably paid way too much, but seeing as I only needed scraps at the time it was quick and easy. I can look up the name if you want, but personally if you need a lot of glass it looks like the place Evan dealt with would be the better choice. Glass Guild or something? It's mentioned in this thread:
http://www.canreef.com/phpBB2/viewtopic.php?t=6284
Kari has twice mentioned to me the name of a place that sells plastics and PVC plumbing stuff but I can't for the life of remember the name (I have a two week memory retention ... what was I talking about again? Oh right
I need a 2" PVC gate valve. Does anyone know anyplace in town that sells PVC gate valves? None of the suppliers I use have anything like that. Western sells them but not ones I can use for fine-adjustments of flow. Last time I needed one of these, I had to get reef_raf to send me one from his local plumber supply in Victora. Apparently common as dirt out there or something. I called a lot of places out here though and completely struck out.