About six months ago I though I had a great Idea, buy a couple of filter adapters so I can use 58mm filters on my small set of 35mm Pentax lenses and grab the appropriate filters from the used selection of the stores in the area. So far the ONLY filters I have found are K2 (yellow) and only for 49mm. Luckily that covers the lens that is on my camera 70% of the time. The local stores have BOXES of UV filters, but not much else. I went so far as to start searching for crap cameras with filters on eBay before I came to my senses and realized that these are most likely scratched. However now I have come to the conclusion that I am going to have to buy these new (Yellow-Green, Orange, Red, 2 and 4 stop ND, and Polarizer). It looks like B+W Filters from Adorama are the cheapest available, but is the quality decent, and are there other "value" brands or places to purchase grey market that I should consider?