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Most map packs are 800 Gamerpoints and need to be purchased via XBOX LIVE. Sometimes, there are discs out there for sale, but I highly doubt there are any for Halo 3. There used to be for Halo 2 though. Bottom line: Purchase from XBOX LIVE for 800 Gamerpoints. (Except Cold Storage, that one is free!!!!)

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15y ago

What else can I help you with?