Such are the questions that keep audio gurus thinking long in to the night. Why indeed amongst all the flotsam and jetsom of the cosmos are there no HPM 700's up for sale as used speakers today? Two thoughts come to mind. One, they are precious collectors items that no one wants to part with. Two, they are just junk and most of them have rotted away by now.
It is possible that a third option exists. I will have to contemplate it.