For sale is my P65+ in Mamiya mount. It was purchased brand new, and it is still in like new condition (with LCD cover still on the glass). Activations are only about 900. It is under Phase One warranty until end of 2013.
Price: $16,000.
I also have a complete Arca-Swiss RM3di kit for sale in another thread. I will provide a generous discount for anyone who is interested in this back together with the Arca kit.