The Resident Evil Collection for the GameCube totally snuck up on me like some crazy ninja zombie.
For $39.99, you get three super-awesome Resident Evil games: Resident Evil, Resident Evil Zero, and Resident Evil 4. Resident Evil 4 may well be the Queen Mother of all survival horror games, Resident Evil is a great remake of a classic PlayStation game, and Resident Evil 0 is a great GameCube exclusive.
The Collection is only available at Ebgames and GameStop, sadly. But it's a great collection -- and for sheer, zombie-killing greatness, these three games are unparalleled.