i'd probably say that "Perun's Purple People Eater's" are the most expensive out there. They went for $610! on ---- a month or so ago. The zoanthids are a deep purple center with green edges and a green dash in the very center. They are extremely slow growing. When they feed, their centers bubble up amazingly. Some other guy sold some knock off's on ---- but they werent the same thing. As far as i know only three people have them... Blane Perun - the owner of the online store that got the original colony of them( he has like 10 or so of them to propigate), the guy who placed the second highest bid and who's company matched his bid(the procedes went to a charity)(who got 3), and myself. I'll try to post some pictures soon.