What is the release date for the Walking Dead season 1 DVD?

My brother really likes the TV Show 'The Walking Dead,' its the first series he's actually been interested in greatly in over three years. It would be the perfect gift for him. If you know the release date for when the season 1 of the Walking Dead series on DVD, please help me out and tell me whether or not it is available for purchase before Christmas.|||March 8 and amazon is taking pre-orders