If you are only planning on using your Gutter Sucker at domestic level then what about using a length or two of ordinary gutter down-pipe? would this work? it would be very cheap, but slightly flexible. Has anyone tried this out?
Obviously for anything higher you would need something with more rigidity.
Personally i can only find 51cm pipe section that fit together, but ive only used it on bungalows. Its really is quite whippy! Ive not been able to build a u bend at the top thou (yet) as i doubt it could handle the weight, so just used pipe angle sections..
actually i can find 38 mm pipe, but i need additional fixings to push together to attach one pipe to another.. might be worth investigating for now. That might be less whippy.

Gonna be fun attaching 20 foot of pipe together in B&Q..LOL
thanks for the advice via email.