Nah, the tubs weren't expensive. They were $4.50 each at WalMart. You could also use keg tubs.
The poles I'm using are 8 foot cedar 1x2's. There's a metal eyelet screwed into the top of each one, so when the bines get to the top, I just let a little more line out. As long as the bines aren't lying on the ground they're fine. I have the tubs on a footbridge over a drainage ditch, so there's 4 feet or so (plus the approx. 18" height of the tub) of room for them to droop before they hit the ground.