To clarify you are looking for American movies, dubbed into Chinese, then english subtitles. This is going to be hard to find.
This is a description of how these movies are obtained, please recognise that it is merely a description, not an encouragement to violate your country's intellectual copyright laws - if they are applicable.
Dubbed movies are either bought when they are released, downloaded using the torrent system, same thing for the pirated version, or found on youku the service I outlined below but you will have to dig through a lot of stuff to find them, I've seen them. They pop up when someone films the movie in the theater and then puts it on youku.
In these versions, you can toggle the subtitles to a few languages including English and they are USA movies dubbed into Mandarin.
It is possible to buy these on Shanghai Craigslist (from expats). Buying bootleg movies there is super duper easy.
Personally I think this is the way to go. They are good movies, you won't get a cultural/translation gap, and they have English subtitles