The AN8's run about 40$ depending on the supplier. The AN8's come with a magnet assembly but it would not work in our use. We mounted a 15 tooth #35 sprocket on to the window motor and then mounted a 1/2" x 1/8" diametrically magnetized neodymium magnet on top of the sprocket. The Cherry sensor was then mounted 2.5mm away from the magnet. Look at the picture in this link.
http://wiki.team1640.com/images/thum...0124_csm_2.jpg
You'll also need the matching Delphi connector to make a cable for it. There are getting to be more and more sensors of this type in the market. Many are much more expensive.