I've looked around for this at various times, but haven't seen anyone selling or trading it. You know that the place that bills themselves as "the only tea plantation in America", is on Wadmalaw Island, south of Charleston, don't you? I know of them, but have never been to take the tour and see if they sell any potted plants.
If you have the patience for it, you can obtain a plant or two mailorder, or buy seed, or get access to a plant somewhere to collect seed and/or cuttings. Both start pretty easily. I had a small "plantation" of ten or twelve bushes when I lived in central GA. My goal was to have enough to feed my daily morning tea habit, and since you only pick the growing points, I figured I needed at least that many. I lost a few to summer droughts even two years after planting them out.....remember it is native to proper monsoon climates with regular summer rain.
Location: Athens, Ga moving to Little River, SC soon