Confirmed. This is bought off of Craftkeeper Irus Tindlefoot for 5 gold 3 silver 3 copper. I have bought over 1k of them over the past few days and can 100% confirm this.
Don't know why...but you left out the fact it can be vendor purchased in Shards Landing. I'm pretty sure its the same one. In fact every expansions version of this is on each appropriate vendor.