Cauldron master

Seems to be the collectibles are fairly rare. They come out of the Cauldron packs, but most people seem to get Bats or Crafting Materials.

U can also buy the collectibles from AH. I made Barr for about 290k

but i only receive bats from that

from random cauldren collectibles from the missions that are given out randomly and from packs at random.

Yeah I would like to know to to create Barr

How can get this ones by sets? vita vea, michael thomas etc