Bioshock 2 for $5.98:
http://www.greenmangaming.com/games/shooter/bioshock-2/
Next to Steam, GMG is my most used company for Digital Downloads.
Highly recommended for fans of the original Bioshock, but be warned that in terms of graphics & sounds, it's identical. If your PC could play the original, it can play the sequel.
Enjoy :-)
EDIT: Not Steamworks compatible (Meaning you CANNOT use Steam to redeam it, though you can download it and add a shortcut to Steam)
Wow it's getting cheaper everyday! Costed me $10 and that was during steams Xmas sale in a 4 pack.
Not to mention the damn MP didn't even work.
To anyone who starts to play, use ice + drill smash! One hit ko every god damn thing you see.