They do carry them, Cindi. They don't carry all of them every year, but they always have a better selection than anyone else does. Most of mine came from Chamblee. I also bought some from Great Lakes Nursery when it was in business, Syl Arena when it was in business, The Uncommon Rose when it was in business, etc.
Heirloom has a very large selection of Buck roses, but the only one I bought from them was mislabeled. I've also bought several from Roses Unlimited, which should be having a big sale any minute now.