The 85 product info page at Polaroid says:
"Please be advised that Polaroid will be discontinuing 85 film within the first 3 months of 2006 due to the phasing out of components used in the production of this film.
"The discontinuation of 85 does not impact the supply or manufacture of 55 film, an alternative to 85. For information on 55 film and the equipment needed to use it, please click here."
(85 and 55 are unique peel-apart instant films in that you can get either a positive or a negative whereas other instant films only give you positives. 85 is a medium format version, perfect for use in the Holgaroid Polaroid film back for Holgas; 55 is 4×5.)