There's also some unmarked sites that are free around Foster's pond. If you park at the end of Chicken Coop Rd. on Potomac there's a couple sites there, and then farther back by the pond itself. Small 1/4mi hike maybe, first come first served ...
Yes, there is both paid camping (cheap like $10 or $15 a night) or free dispersed camping 200ft off main trails. Google the national forest and go to their website, they have all the information you will need including maps and regulations and activities
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