If you're a PC gamer and haven't already tried Tomb Raider: Underworld, this could be the offer that clinches the deal. Valve's Steam download service is offering Underworld at 75% off its already reduced price, but only until Monday. If you have a Steam account, just log on and check the latest Update News. Otherwise, visit the Steam site to join. Or, go right to the Underworld page for more details.
I can't think of a better way to to spend a snowy weekend than adventuring with Lara. If you already own the game, you may be interested to know that Steam also has a gift-giving option so you can share the Tomb Raider fun with a friend. :D