Borderlands’ DLC goes physical in early April

Borderlands‘ downloadable content’s somewhat odd retail release has been dated and priced; The Zombie Island of Dr. Ned and Mad Moxxi’s Underdome Riot — but not the latest and largest yet The Secret Armory of General Knoxx — will arrive on store shelves under the Borderlands Double Game Add-On Pack name on April 6 in North America and April 9 internatinally, for $20, and for only the PC and Xbox 360.

We’re not exactly sure why the Knoxx content isn’t included in the release, or why it isn’t releasing on the PS3, but with more DLC reportedly on the way, we’re guessing another retail pack is just a matter of time.