Santa Rosa is real nice company with a good selection, I accedentally ordered from them twice and when I realized it I emailed them and asked for combined shipping and they were right on it. They gave me a 8 or 9 dollar credit for the second shipping charge.
Another good company is Plant Delights,
http://www.plantdelights.com/ , They carry a lot of native plants as far as the southeast goes. Great packing too.