BlahDVD are selling "Ninja Gaiden Sigma" for the Sony PS3 for £17.99 (inc Del.)
You can get cashback through the usual sites (e.g. 8% Quidco makes it just £16.55)
The next best price seems to be £23.99 from PowerPlayDirect.
The ultimate ninja is back - more challenging and more beautiful than ever. Ninja Gaiden, the game that Gamespot called "about so close to perfection as action games get", is making its debut on the PlayStation®3. Play as Ryu Hayabusa, a young master ninja who seeks vengeance against those who attacked his village and stole the Dark Dragon Blade. Featuring new features including dual weapons, deadly new enemies, and the ability to play as Rachel.
- New playable character and missions: Play as Rachel and discover three new exclusive chapters for the PS3.
- New weapons: Double swords and others. be sure to try "Burst" (Ninpo), specially designed and prepared for Rachel.
- New enemy characters: Approx. 10 different types are added. Be careful with their AI that have become more advanced and merciless.
- New actions that allow players to perform wide range of skills and attack. Such as "running over the surface of water" and "shooting arrow in the air".
- Six-axis function : By shaking the controller hard, (1) the power of Ninpo (Ninja Magic) can be increased and (2) let player character escape from hands of an enemy when he / she is grabbed