Can't point you in the direction of any but be wary of those hydraulic ones a-la sealey etc, they're pipe benders not tube benders .
A decent tube bender won't come cheap though
pipe benders are mainly used by plumbers for bending copper(soft metals etc)and are hand benders, then there are hydrulic pipe benders are mainly used on the thicker pipe (i think is over 3mm)and used for roll cages,mild steel pipe work and are hydraulic,the old ones are the best ones as always,be weary of the clarke 1s as the framing has been known to bend. The tube benders are hand held and bend small copper pipe(the very thin stuff) like you use for the boiler super heaters on model steam engines etc
hope this helps mate
and pipe bender is sufficient to bend tube as long as you shim the pipe so it fits the die correctly also if you cap 1 end of the tube/pipe fill it with water then fill it with sand the sand will displace the water and fill up the pipe making it very hard to crush.
i have seen this mehtod used on exhaust pipe and it worked well, i wouldnt try it on a 180deg bend tho.
dunno, i just told ages ago that pipe is internal measurment due to the fact its being used to transport whatever through its internal bore, while tube on the other hand is used for roll cages etc so its measured externally as the internal bore bore of tube is failry irrellevant, i was told this by an american tho.
I cut the head off a record plumbers bender and welded it to a 100 x 100 box welded to a 300 x 300 x 10 plate bolted to the floor so you are bending horisontal instead of vertically and have been bending 1 1/4 10swg. C.D.S. without any problems with little or no shrinkage on the inside rad.