I believe the cloak drops off last boss in GCH, which is why its so expensive. Most of the bosses in Kulch Nest easy should be easily clearable, its really as hard as maybe RT normal.
Farming arrows is currently the fastest way for EoJ's, if you're not farming them already, they drop off mobs near the Kulch instance. Although, as mentioned above, EoJ's aren't as good as before, since stat drops got nerfed, and you now have 6 crap stats and 2 decent stats (if Matk/HP counts as decent...).