I don’t think I’ve ever seen any for sale anywhere either. I do have Rotkottig frau Ostergotland grafted to my Harrow sweet in a few places curtesy of @BobVance. I think this is second leaf since grafting and no flowers yet. I can’t remember if Bob got any fruit from his yet.
Anyway, I see you are in PA, so if you happen to be coming through the Arlington, VA area at any point I’d be happy to cut a piece off for you to use for bud wood. If you have any pears currently growing, maybe budding over the summer will get you a little further along than waiting for scion wood next year. Also, several people have had luck grafting scions in the summer as well, so you could try both.
I’m not sure if this is a variety you are interested in, but happy to share if you want it.