The Elder Scrolls V: Skyrim DLC will go on sale for Xbox 360 players for half price starting March 26th 2013-April 1st 2013 during the Xbox LIVE Spring Sale. This includes Dawngaurd, Hearthfire, and Dragonborn. These deals are available for both Xbox LIVE Gold and Free members. This will allow all Xbox Live users to pick up all three DLC's currently available for only 1800 hundred microsoft points. Also, the 1.9 title update, which brings the legendary settings, is being sent to certification on the consoles later this week.
Dawngaurd- 800 Microsoft points.
Hearthfire- 200 Microsoft points.
Dragonborn- 800 Microsoft points.
Sources:
http://majornelson.com/2013/03/22/xbox-live-spring-sale-2013-starts-march-26th/
http://www.examiner.com/article/skyrim-title-update-1-9-heading-for-console-certification-next-week