All the areas mentioned above. I think you will find stuff/charms/grand charms to trade for your elite bow long before you actually see one drop. For the amazon specific bows pick up the non socketed gran matron and matri. Use the cube recipe to put sockets in them. Granted there is a chance you will not get 4 sockets, but when you do....this is how I was able to make several faith and ice bows. Good hunting.