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