I, as well as several others, have had difficulty finding this mythical thinwall PVC. I mean McMaster doesn't even stock this shit. Here you can get it for a fair price, and the shipping doesn't totally ream you so long as you use the code above. It also seems that they have shipping discounts fairly often; their facebook page shows that they had discounts for July and August too. Might be a good idea to follow it, particularly if you are like me and have no means of getting this stuff locally.
I am in no way affiliated with FlexPVC. I just shop there. Didn't put this in the "modding materials" thread because it's such a niche material. And also time sensitive.
EDIT: My order was ten two foot long pipes of 1-1/2 thinwall PVC. Shipping was reduced to 10.16 USD.
Edited by Aeromech, 20 September 2014 - 12:59 PM.