Well my resources sell also on my vendors, esp.feathers but that won't make ya rich.
Cloth always sells, least mine does. Oddly yarn has sold out, I put it on lil 12 bundles thinking someone may want a few for assorted cannon ammo, it sells out, but that won't make ya rich either.
As for leathers, wood, lower end, and ingots lower end, some times someone buys mine all up, & the rest of time they sit on vendor.
All the resources & bs needed for imbuing will sell surely too.
I don't fool with those at all.
Saltpeter if one has the TIME and patience to get a lot of it, would sell too.