Torrents would be your best bet. You need a download client, Utorrent is a popular one. Then you can search from right in Utorrent, or you can use sites such as mininova.com or isohunt.com to search for your content.

Just as a warning, they are cracking down on people downloading illegal content like movies and music. My boyfriend’s family regularly downloads movies and music, and they recieved an email from the government or their ISP saying they were being monitored. Be careful if you choose to continue. It is an illegal activity and you can get in trouble for it.