Amazon.com has released Season 3 of Downton Abbey for Prime subscribers. The first episode is free.
Don't want to subscribe to Prime? The first month of Amazon Prime is free, and you can cancel before the month is over to avoid charges. But I highly recommend the $79/year cost. It is cheaper than Netflix or cable, and there are thousands of movies and shows to choose from. If you are a fan of BBC television you can watch several seasons of great shows like Doctor Who, Sherlock, Upstairs Downstairs, and the BBC production of Jane Austen's Emma all for free.
The two-day shipping (which sometimes arrives in one day for me) is unbeatable too.