Not too bad. Right outside Breakers Point there are 3 groups of naga that a solo R/Rt SoS can farm (carefully) and they dropped 1-3 skins each run. If you pull the first group the NPCs at the resurrection shrine will help. On another of the groups sometimes the Outcasts will fight them and as long as you get some hits in they sometimes drop then also. Of course then you have to kill the Outcasts, but they are easier than the Nagas.