I am just starting to gather the materials for a new smoker build. I have noticed many people on here asking about places to get tanks and I stumbled across this resource:
They are located in WA and AK. They aren't as cheap as picking up a used tank elsewhere but if you know exactly what you want, they can roll it and weld it up for you to get you started and the prices weren't too bad. I am getting pretty fancy with mine as I want a double walled smoker (too much rain and other temperature issues up here causing fluctuations in my temperatures) so they are rolling me two tubes at 24 & 26 inches in diameter by 40 inches long using 1/8 inch steel for right around $400, delivered (I am local to the WA location, not sure if they ship)
Once I get all the parts and pieces I will update with pictures as we begin the process (I am working with a friend to build this).