I am not sure if this company in the U.S. but for Canadians LeeValley a big gardening store is now selling Air root pruners. The size is just the seedling plugs but hopefully they will start caring the bigger sizes or maybe they would be willing to special order. I still excited anyways and will hopfully be buying some soon. Here is a link

http://www.leevalley.com/garden/page.aspx?c=1&cat=2,47236&p=56130

Valencia, the air root pruning germinating container shown in your link are the finest germinating containers available. They are the only germinating container I ever use. - Millet

Thanks for the info Valenciaguy, I just called them now and I was told they would not be receiving them in larger sizes. But it was a "probably will not be receiving..." not definate. Maybe they'll change their minds in the future in they seem popular.

Didn't inquire about special orders though...

thats good to hear hopefully they will change their minds.