I've seen one only once at Shark Aquarium in NJ. 14". Bought for $180. It would not eat anything I offered it. I could not break him and lost him - broke my heart. Since he was in a community tank, I didn't offer anything live. Perhaps that could have saved him, but I was not willing to risk introducing a decease to my large community. Another reason to have a quarantine tank and quarantine new fish.
I'm not buying them now I'm getting a bigger tank soon I'm jut researching fish before I think about getting them I thought it was cool so I'm asking questions