If you're looking for a cheap and easy way to pick up both Deus Ex games and a fistful of other titles at a low price, look no further than Steam's "Eidos Everything Pack." For $99.99 you get a total of twenty games, including Deus Ex, Deus Ex: Invisible War, Thief: Deadly Shadows, the two latest Tomb Raider games, and many others.
Quite a deal. Too bad I already own about half of these...