All six Star Wars movies have been launched in digital HD yesterday. The entire collection costs $89.99, and is available in iTunes, Google Play, Vudu, and Disney Direct. Leo says not to get it from Disney, however, because it doesn't own the first movie "A New Hope." However, Disney has a new service called Disney Movies Anywhere, which gives you access to the movies in any of the digital stores. Leo recommends against buying it from Amazon though, because that doesn't work with the Disney Movies Anywhere service. So unless you know you're going to play it back only on devices that can play back Amazon, it's not a good idea.
Get the Star Wars Digital Collection on any of the stores at starwars.com