Scroll down a little and it will say Best Value. It says buy Bioshock and get The Darkness as a free gift.
Update: Now available at EB/GS
Use coupon code SAVER for free shipping
Frys.com has a deal going on where you buy Bioshock and get Darkness for free:
Price: $49.99 + S/H
EDIT: Corrected the Fry's price to $50, thanks TouchH2!