Eric,
I'm guessing with your zone being 6b or 7 you are talking about Louisville Ky. If that is so, I am air layering a couple RbBs that should be ready in about a month if I did it right, and I am about an hour from you. I may have a few extra cold hardy varieties in 1 gal. if you are looking for more than 1 tree.
Got a bit carried away with cuttings and eBay trees last fall and winter and now have about 100 trees of about 60 different varieties. Never expected so many of the cuttings to take and flourish since it was my first time rooting. But it's a good problem to have!
PM me if that is your location as it would be easy to get you some trees.