I am also getting into a plantation search and just found this nice link. When you open it, you will see a lot of NC and other plantations; open the "Brown & Meares" link at the top of that page and you get even more for NC. Notice that White Rock place in Halifax Co.
For myself, I am looking into Hairston plantation in Forsyth Co., NC, which is on the list, and seeking but not yet finding a Pleasant Garden in the Mulberry area of Lincoln Co., TN. Wishing you luck.