Professional Photographer's Resource in Atlanta has a used one in truly mint condition for sale . I think they are asking $450. It is on consignment. (This is not one of my heads BTW, I just saw it there today) their web address is
http://www.ppratlanta.com/ and phone number is 404.885-1885. Ask for Johnnie.
A review of the head is here:
http://www.naturfotograf.com/burzynski.html