There are 3 GameCube system promos this week:
Buy GameCube system for $99.99 at Target and get Spider-Man 2 for $9.99 (or buy GBA system and get Spider-Man 2 for GBA for $9.99). This is in-store only.
Buy GameCube system for $99.99 at Circuit City and get a Nyko memory card ($14.99 value) for free. This is in-store only.
Buy GameCube system for $99.99 at Bestbuy.com with free shipping and get NBA Live 2003 for free ($19.99 value). This was last week's promo but apparently still good online: