I believe this is the deal at TRU...(confirmed)
Buy: Mechassault 2, Forza, Halo 2, Doom 3 (i think), Project Gotham, or Crimson Skies and the Halo Headset will be $19.99, (normally $50).
Cheap ass link use code RTLXBXHLCMMT
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they're also selling the Nintendo DS + Mario 64 + the starter...