If you decide to go the Series filter route - i.e., attach a ~37mm series VI push-on adapter and then use interchangeable Series VI drop-in filters - eBay is your best bet. For example, I have purchased from seller macintoshcat who offers a variety of sizes inexpensively and currently has a Kodak branded 36.5mm push-on adapter available (scroll down in this listing until you come to Series 6 push-on). You should know that the tangs on these can be bent slightly in our out a small amount to accommodate a specific size, and I am pretty confident that the 36.5mm size would fit your lens just fine. One non-eBay vendor that typically has these in stock is songofsnow.com), but they tend to ask considerably higher prices.