Try one of the best sites out there and a personal favorite of mine. I have bought atleast over a dozen films from this guy,as well as 2 or 3 horror cd soundtracks from him...Never ever had an issue,not once. Top notch. I must reccomend ( Typo ,maybe ) highly.
Xploitedcinema.com
http://xploitedcinema.com/catalog/index.php