Doesn't seem like your getting an answer. I wish I could find the card from the vendor at the Phil. Flower Show who had begonias. They was in PA but not far in. I got several varieties from them. They even had your famous escargot but it was too big for me to carry around so I left it. Rats again. I never see it locally anymore.
I got my begonias from Bob's in Egg harbor on Rt 40. I have them in baskets so I can take them in during the winter. They are doing very well, with one exception. The last rain really knocked off a lot of the trailers.
Datdog, I've seen a couple of nurseries carrying a variety of begonias now. Look for the Proven Selection's Line with the fancy annuals. Up here, Conduros and Fairfield Gardens has quite a few. I'm sure you could find them by you.