Here, you can peruse the catalogues of nursery growers. You can buy directly from the grower. Each grower is different so look at the terms and conditions. Most have minimums.
Most growers tend to specialize in a particular area.
One may grow wild flowers, another trees for reforestation, another might specialize in azaleas. Most of the growers do not have e-mail. Their catalogue will have the information about how to contact them. A nursery specializing in growing and shipping native plants. Catalog A grower and seller of Southeastern native shrubs and perennials.