I am about 2/3 of the way through the game and really enjoying it. I just looked up the DLC, since I am planning on picking it up after completion. However from the game marketplace on my 360, episode 13 is posted twice. With 2 different price points ( I think it was 320 and 560). The descriptions are identical. Can anybody tell me what the difference is before I complete the game and get ready to purchase?