Good places for farming materials?
In my obsessive need to have the best of each piece of equipment I make I've found myself going through a lot of crafting materials. The crates and shells are easy enough, wood and skulls aren't too difficult either, but I'm at a loss for finding good places, that is to say ones that are quick and easy to finish, for the higher end items, which include but are not limited to, the slingshot branches, paper, and bamboo.
So I'm asking the more experienced in this game, where you farm the materials for your weapons and off hands?