6inch/150mm+ wide aluminium / Stainless / ABS tube, 2m+ long (Dursley GL11)

I'm looking for 6" wide or more aluminium / Stainless tube, 2 metres +.

I want to try bending wood as part of my woodworking hobby, and the tube will be for a steam chamber. UPV-C and other materials deform at 80c so only ABS plastic is an alternative to the metal. Condition relatively unimportant (so long as not full of holes).

As it's only a first attempt I'd like to do it on the cheap and see how it goes. Thanks!