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Another day in the Direct2Drive (D2D) 30 Days of Deals sale and today Bioshock 2 is on sale for $4.95 ($19.95) which is 75% off. Use the promotion coupon code 6399EB21FB4378D7282AC9FE6BF16452 to save 15% off your puchase to make the game $4.21. (Click here to generate a new code if the other one is expired.)
The deal is also going on at the D2D UK site. Bioshock 2 is only £2.49 (£9.95). No coupons for that site however.
Same deal is running at the IGN PC Store. The game is on sale for $4.95. No coupons for that site either.
This is even cheaper than the price during the Steam 2K Week Sale.