http://maxsaver.net/B-W-Filter-Kit-X...-CPL-77mm.aspx
this one works
yes they do have that one for 145...I got mine for 150 a few months back (i have the slim 77 Kaesemann MRC CPL and the slim 77 MRC UV)....
its no scam, Ive bought from there, and two of my friends have purchased, I am 100% positive they are real B+W
it just takes a week or so to arrive since it comes via Hong Kong Post...but they give you a tracking #
(they even included a free tiffen filter holder when I ordered mine...just came in the package by surprise)