Wishing you best of luck to finding one soon. They are not easy to come by. I was able to pick one up on here couple of weeks ago after looking for a black one for several years.
Good luck, I found one unboxed six months ago after scouring various internet sites for three years. I found mine at UsedPhotoPro. Paid about $6K for one in great condition with slight brassing only on the advance lever. There are some individuals you may want to check with, like Tim Lei, Bellamy Hunt or Kevin Fickling, all those guys have some internet presence and might be able to tap into a deeper network.