If you want to have a go yourself?
i've successfully bent plenty of seamed CHS 42.4 x 3.2mm tube with a similar bender to the Clarke one,
where people assume they don't pull a clean bend is because the formers are a bit sloppy for the tube size, they're water pipe sizes marked in internal bore size, when they say it'll bend 2", it's closer to 2 3/8" o/d,
you need to a piece of 18-20 guage sheet about 12"x4" across the former that mades a reducer that can be reused,
lay it across the former then pull a bend, the tube will pull the sheet into the former and self make the reducer, then you'll get clean bends,
i get 42.4mm x 3.2mm CHS 7.6M long from FH Brundle for about £20? a length.
i use this machine, does the same job as the clarke,
if you look close you can see the reducer in the former, obviously trimmed with tin snips to fit the size of the former.