I don't know how much it gets run but you can put in at North Fork and go to Cache Bar or Corn Creek. About 30 miles maybe.
I don't think you can purchase them in NF, but could be wrong.
I have a couple extra and Chip sent me one or two last year so I am happy to mail one over - as in free. Pm me with addy, and if I mail it tomorrow you should bet it Thursday or Friday. Don't know if that works.
The Pine Creek section probably has the biggest rapids on it, but I would love to float this stretch someday myself.
A lot of the river left side is public land, but there are pockets in there that aren't. When the road is on the river left side, much of that is private.
While I wouldn't want to camp in someones yard, high water mark to high water mark is public land. There are lots of beaches in there that you could over night if you wanted and be away from people and the road to a certain extent.