The dealer who I know was briefed did suggest a street price which I will not repeat here in the spirit of the Hitchhiker's non-disclosure agreement. It was significantly less than I had imagined.
I am thinking exactly as suggested above, one for controller and one as a remote speaker unit for wider stereo (like a Tivoli). A good alternative to a pair of DSP3100s in the bedroom.
Also there may be hope for those who want a plug-in card for AM/FM and DAB for their 861s. The minature circuit boards must surely be transferrable?