Anyone using a tube to vertically stack their tires?

I found a plastic vendor that sells acrylic tubes that are the perfect size to stack the tires (5" inner diameter and 5 1/4" outer diameter).

The only problem is that they only come in 6' long tubes. The 6' tube is ~$50 so I'm looking for 2 other groups who want to split up the 6' it'll be $15-20 for your 2' section of tube.

Heres the webpage for the plastic vendor http://www.plasticworld.ca/default.asp?pID=65

If you wanna split the tube email me at timothy.ahong@utoronto.ca