Square Enix is currently holding a large publisher sale on Xbox Live.  The list includes nearly 50 items including games and downloadable expansions at 50% off.  Live users can get Tomb Raider: Underworld, Tomb Raider: Anniversary, Lara Croft and the Guardian of Light, Deus Ex: Human Revolution, Sleeping Dogs,  and Dungeon Siege III among others for a discounted price.  The sale runs until March 18.  You can see all the available items on xbox.com.