Back glass gasket

Hey all. I need a new rear window gasket. Where it the best place to get one? Thanks.
don't knowhow good they are , but $90 -100 is the price i see all the time . I'm buying as well , same leak in the trunk from the rear glass
http://www.nationalmoparts.com/index.php?page=shop.browse&category_id=427&vmcchk=1&option=com_virtuemart&Itemid=53

another site
http://www.jimsautoparts.com/weatherstripping.htm
http://www.nationalmoparts.com/inde...=427&vmcchk=1&option=com_virtuemart&Itemid=53