Corrugated Aluminum Pipe?

[BWS29128]

Anybody got any good sources for corrugated aluminum pipe? I need annular rings as opposed to helical or spiral rings. I'm looking for 2 sticks of 20'L X 42" dia pipe in the 14ga-11ga range with the 3"X1" corrugations. Base metal shouldn't matter, but I'm thinking in the 3034 to 5056 range. Any help would be greatly appreciated!
~Clint

[HMW]

What are making? Columns or something?