Valve Software’s The Orange Box is on sale for $9.99 all weekend, meaning you have approximately fifteen hours left to do what you should have done when it was $50. This purchase gets you Half Life 2, Half Life 2: Episode 1, Half Life 2: Episode 2, multiple-game-of-the-year-winning-and-critical-darling Portal, plus the relentlessly jolly Team Fortress 2. Remember if you already own any or all of these, you can gift them to fellow Steam subscribers at …