Hello...first time post here. Was sent from another forum to check out this very post. Here is a great resource for all kinds of parts and I did find Clear pipe and fittings.
The PVC pipe is expensive but if you have enough people who wanted it maybe you could split it up...
http://www.mcmaster.com/#plastic-pip...d-pipe/=5ouetf
Just click the picture of the pipe to see the sizes available...1/4 - 6"
Here is another one, but acrylic. This is cheaper...
http://www.mcmaster.com/#acrylic-pipe/=5oukom