What are you thinking of Oakmancritters - veggies, ornamentals, heirlooms, standards, "cutting edge," landscaping, trees?
Park Seed Company is probably THE premier seed company in the Southeast (South Carolina). Whillhite Seed Company in Texas has been around almost as long. I haven't ordered from them before but Park has been a source many times.
If you want to order in bulk, I've got some ideas. Seed companies in Maine have been a good source for me - Johnny's, Fedco, and Pinetree.