So far the cheapest ive found clear pvc is at
www.usplastic.com, where it is $5.02 per foot for 2" pipe, but they will only sell 10 ft sections which is 9ft too long for me. Im dropping the idea of using acrylic pipe because of its incompatibility with PVC fittings, and its price.
and so the search for the cheapest clear tubing continues.........