Try Ritz Camera at Ritzcamera.com(they tend to be a bit high); Berger Brothers at http://www.berger-bros.com/; or 42nd Street Photo at http://www.42photo.com/; I have only dealt w Ritz out of these mentioned above, and had no problems and got a good deal with a special sale/promotion. Debra
Nikon has discontinued its A2 filters. I spent a Saturday two weekends ago traipsing all over Tokyo looking for a 52mm A2 filter and couldn't find one anywhere. I did manage to find a 72mm A2 filter which I snapped up for my new AiS 180/2.8 lens If you can find one, snap it up!
Thanks for the information on the Nikon A2. I ended up buying a Nikon polarizer (thin) and a B+W 81A from Adorama (both new). It is too bad Nikon does not care about us. B&H told me it is discontinued. I also bought a 81B from a Nikonian. Have a great day! Thanks, John.
Filters have always been a bit of a sideline for Nikon. While of excellent quality, distribution has always been spotty and the line a bit thin. In addition, other brands offered retailers higher margins, giving camera stores a strong incentive to downplay Nikon filters.
I very much doubt it's a matter of Nikon "not caring," but rather trying to concentrate its efforts elsewhere. In an increasingly digital world, it's likely sales of this sort of filter have been dropping pretty quickly.
B+W and Hoya still make multicoated 81A's, so I'm less concerned about this particular discontinued product as I am about losing the 6T. Used 6T's have already hit the $100 mark on that famous auction site.
"There is no real magic in photography, just the sloppy intersection of physics and art." — Kirk Tuck