If they are healthy, someone might want them.
If it was me, I'd give them to the first person who would come and dig them out. A 7 foot rhodo will be no small project. (Actually I AM me, and I've planted more ... )
You could put it on
http://portland.craigslist.org/
and see if you get any bites.
Otherwise, give them to your neighbor who values them so highly.