Following May's Anchorage and The Pitt combo-pack, Bethesda has confirmed with Joystiq that the second Fallout 3 DLC retail pack featuring Broken Steel and Point Lookout will hit store shelves on August 25 for $20 on both Xbox 360 and PC. You'll need Mothership Zeta – the fifth and "final" piece of Fallout 3 DLC – to round out your DLC collection. It's currently available for $10.
If you're late to the Fallout 3 bus, you may want to consider holding off until October when you can pick up the previously announced Fallout 3 Game of the Year Edition which bundles the game with all five DLC packs. It's currently listed for $59.99 for the PS3 and Xbox 360 releases, and $49.99 for PC with an October 13th release date on both Amazon and GameStop.