I must admit, I've been pleasantly surprised by the deals over at GoGamer lately. As part of their 48 Hour Madness (read, act fast), they're offering the BioShock 2
Special Edition for Xbox 360 for a mere $79.90 with free shipping (use code SHIPFREE25). The next best deal I've seen is at Amazon, which prices the set in the high $80's.
If you haven't picked up the game and you're a fan of the series, you'll dig this package, which includes a vinyl of the original BioShock soundtrack and some posters with hidden messages that can only be activated by blacklight. Yes, finally a reason to set up that blacklight.