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Free Game with Purchase of GC
From February 3rd to March 20th you can choose one of seven games when purchasing a new GameCube. These games include Eternal Darkness: Sanity’s Requiem, Wave Race: Blue Storm, Disney’s Magical Mirror, Doshin the Giant, Luigi’s Mansion, NBA Courtside 2002, or Pikmin.
*I believe this is an European offer, for twop reasons: Cube-Europe reported it and Doshin was only released in Europe and Japan, while Animal Crossing was only in the US and Japan.
Source: http://www.cube-europe.com