I Don't know if this answer comes too late but I have used "Fullmovies" site to watch movies legally for some time now. I have nothing but good to say about the page and the system. You can stream or even download the film you want to watch and the quality of those movies are HD. And what comes handy is that you can watch those movies also from your cell phone! :)
About the cost, it's one time thing. Once you have rigistered and payed you can watch and download movies as much as you want. I have found it very convenient for my needs at least.