I use the chinese finger trap stuff. Went to a marina one time (in Port Orchard) and asked about it. They had extra left over from a previous rigging job and got it for a few bucks. I may have a few sections laying around, but that doesn't do you any good over here, lol.
Spencecj1 got some vac hose somewhere and used it. He got the color of his boat. Maybe he will chime in and let u no where he got it. I do no he had to order more than he needed too do his boat. Want to say 15' maybe. If mine wasn't put up I would get a pic because I used some on mine.
Allyfishing had the link in the post F2008 listed above. The hose is bought from a car wash supply house for their vacuum cleaners. Looks like you have to buy 15' for about $46.