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Now I'm not a 360 owner (call me a future owner, heh) but I keep up with 360 news, and from what I can tell you must have a Live subscription to get any map packs, or any downloadable content in general. I'm sure a 360 owner can give you more details. However, I did see a Halo 2 map pack once on disc in a store, but this was a couple years after Halo 2 had come out. So basically for the time being you need a Live account.