There's no camping at the Bald but there is nearby....Google works well to find what's open right now. If you want free camping, then you'll need to travel a ways.
No camping in the state park, which governs rumbling bald. Air bnb could be an ok but pricey way to be close to the bald, I also can point you in the direction of a spot for camping within 25 minutes of the bald if you’re up for hiking.
Hitching Post campground was cheap, 10 minutes to bald parking lot, Payed via money in mailbox, warm showers in winter, 1mile to ingles; better than sleeping in walmarts parking lot thirty minutes away.