http://fullmoonstreaming.com/ Full Moon's entire movie output is available. If you like your horror/scifi extra cheesy and cheap
Troma has their own youtube channel
https://www.youtube.com/user/Tromamovies
http://www.frightpix.com the streams run a little slow sometimes
http://www.bmovies.com/ great site and again, a lot of cheap, cheesy movies, just how I like 'em ;-)