This filter came with a used lens I bought a few years ago - I took it off and haven't really used it. Might as well pass it on to somebody who will. It looks more or less like a part of the lens when it's screwed in.
http://www.adorama.com/LC39UV.html
$45 + $5 to ship priority with the CONUS.
http://www.adorama.com/LC39UV.html
$45 + $5 to ship priority with the CONUS.