Trouble with the Wildings
Skins, wood carvings, rustic leather goods, jerky,wool from animals native to their lands*, nuts from trees that grow in the higher reaches they live in, assorted herbs etc.
The mountain goat and other wools are stronger and a bit rougher than that of domestic animals. They never have a lot of it, but woodsmen and the like are willing buyers for it's tough fibers and ability to shed moisture up through light rain. It readily accepts some dyes, and can be made into a mottled green/brown cape.