I can't help you with finding them other than to suggest checking with a good local nursery. As far as transplanting, from what I've read the key is to do so before there is any swelling of the buds. Grapevines have a very long taproot, and you cannot hope to get all of it, but get as much as you can, re-plant at the same depth, and then trim back the top growth to about as long as the roots you were able to dig out. Good luck!
You're welcome, Fred. Hope you find 'em.