The place I found this stuff at was Industrial Paints and Plastics. They seem to have several franchises out on Vancouver Island, the lower mainland, and in Alberta. I don't know if it's the best deal or not, but the extruded clear acrylic tubing, 4" OD was $60 for 6', so about $10/foot, and they happened to stock it, so it's not a special-order item or anything. I didn't ask them about cell-cast acrylic tubing (which is supposed to be much higher quality and more expensive), however ... so I don't know if they'd be a good place if that is the stuff you're looking for.
Here is their website:
http://www.ippnet.com
[ 12 April 2002, 10:21: Message edited by: delphinus ]