I used to sell them 4 years ago for 300k (started out at 2 mill, but supply went up). They used to be gotten in only 2 places. One in Ilshenar, and in Khaldun. Generated every server up. No idea what they are worth now. I do know that they only spawned for six months. Unless a new source popped up, they are no longer spawning. Makes them ultra rare (i think).