Upload & Sell: On
The 105mm polarizers are expensive, and up until reciently, the B+W ones were not even available in a multi coated version. I am a strong believer in multi coated for digital photography, and normally also want a top quality filter.
My first 105mm polarizer was a low cost one from an auction site, and it works pretty well for me. It is still available, and is listed as a multi coated filter. I can confirm that the one I got is indeed multi coated, which you can tell by looking at the intensity of a reflection from its front in comparison to other filters. The brand is Zeikos, and for somthing that costs less than $40, it is a good value. Here is one link to the filter I got:
I have not yet had a need to clean this filter, and that might be a place where it is hard to clean or easily damaged while cleaning. But the results in my images seem good.
I only rarely use this polarizer with other filters on my Lee holder. For almost all of my polarizer needs, I rely on high quality multi coated screw on filters that match my lenses, and are compatable with my individual lens hoods.