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If you buy them now, you're just paying for them EARLY.
No, every Halo 3 map pack comes free on an extra cd with Halo 3 ODST.Personally I couldn't find it any more simple.
Chunky_Lover's Average Joe InterviewBungie All Star Contest Winner Weeks 6,8 and 12
You will get the all maps free in Halo 3 ODST.You will not have to re-purchase them, once you have them they are yours.