There are some local gas stations within 10 miles on Rt41 and Rt61 that both might sell some. Other than that, closest would be to go into Beckley to Kroger, Walmart, Lowes, or such. In any NPS campground in the park you are allowed to cut [with hand tools, no power tools] any DOWN dead wood there is. But no cutting of trees that are upright, dead or alive.
I will
When I was at Glade Creek campground, the volunteer supervisor was selling some.
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