Cheapest I could find, Mafia II Special Edition with bonus DLC for Xbox 360 and PS3 £22.99
Also for PS3http://shop.gameplay.co.uk/playstation-3/mafia-ii-special-edition/_/PX1276/productpage.html
Mafia Special Edition contains:
* Exclusive box art
* Map of Empire Bay: Get familiar with the neighborhoods and own the streets with a high quality, tear-resistant map depicting the 10 square miles of Empire Bay and all the hangout spots.
* Made Man and Greasers DLC Packs: Free access to in-game downloadable packs each containing two new vehicles and two new suits.
* Betrayal of Jimmy DLC Pack (PS3 Only): Loads of new city-based missions to keep you driving and shooting through Empire Bay.