I bought the Orange Box yesterday for 14 dollars at a Blockbuster. Yeah I know, I'm about 2 years behind the ball, but at least I managed to catch the train late. All 5 games on the disc are amazing (what else can you expect from Half Life 2?). Team Fortress 2 is hilarious, btw. My favorite character to use is the Engineer ('cause he's from Texas, like me), but since I'm just starting out, my sentries are only a level 1...
The fact that I don't actually have online for Xbox yet doesn't help either. I'll buy it someday when the money isn't so tight.