2K Games and Gearbox Software announce plans for Borderlands Double Game Add-On Pack, the retail DLC box for Borderlands, Gearbox's role-playing shooter. The plan for this is different from what was revealed earlier this month, as it will contain the first two DLC releases, The Zombie Island of Dr. Ned and Mad Moxxi’s Underdome Riot, but not the third DLC, The Secret Armory of General Knoxx, which will continue to only be available via download. The Borderlands Double Game Add-On Pack will be available for $19.99 USD for Xbox 360 and PC on April 6, 2010 in North America and April 9, 2010 internationally.