If you ever had a call for clear rigid tubing that's not used structurally or weight bearing, then you might consider the packaging type tube. They are a LOT cheaper than clear schedule 40 PVC!!!!
Here is a place that sells them in various sizes.
http://store.visipak.com/home.php
Here is a place that sells them in various sizes.
http://store.visipak.com/home.php