While shopping at Walmart just now I saw that they have the complete collection of Girls and Panzer on DVD for $34.96.
It's a 3 disc volume with all 12 episodes on it. Specials are introductions 1 and 2, Japanese promos, Japanese TV spots, Clean opening and closing animation, and Sentai Trailers.
They did not include any of the OAV's :(
I also took a picture of the front and back of the DVD.