If you're heading up Rt. 16 to get there, we saw 3 or 4 places on the roadside to buy firewood between Tamworth and North Conway. IIRC a "campground size" bundle was $4.00.
We didn't travel on Rt. 302 this visit so I'm not sure what's available between Twin Mountain and Glen.
Theo & Carol
2007 GoldenDoodle ("Cooper")
2020 Rockwood Roo 23IKSS
2015 F-150 4WD XLT SCab, 5.0L, 3.73, 36gal, HD Towing Pkg (53A), 1,980lb Payload