On the release of Shutter Island you’ll be able to watch the complete full movie online for free. I found a few really good sources to watch Shutter Island online, and posted the links below. Just ignore the broken links that i crossed out.
http://btjunkie.org/torrent/shutter-island-dvdrip
http://clickthestream.com/shutter-island/
http://bit.ly/9WWSJ9
http://piratebay.com/shutter-island/