@SupaPhly part of the reason could be that they are more responsive to FOREX fluctuations than MS or Valve. The other reason is that we are so small for Sony that they can't be bothered to match what happens on the other platforms.
If you have both consoles it allows you to price shop, i've picked up a few games this way.
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Ghost In The Shell / Ghost In The Shell: Innocence Double Pack [Z2]
Available for Order Normally dispatched in 21+ Working Days
Ghost In The Shell
The year is 2029, the world is made borderless by the net; augmented humans who live in virtual environments. Watched over by law enforcement agents that are able to download themselves into super-powered, crime busting mecha. The ultimate secret agent of the future is not human, has no physical body and can travel freely through the information highways of the world. Hacking and manipulating whatever, whomever and whenever required...
Ghost In The Shell: Innocence
When machines learn to feel, who decides what is human? It is the year 2032 and Earth is a world where the few remaining humans coexist with artificial replicants, cyborgs and robots. Batou, a cyborg detective and his partner, Togusa are charged with investigating the bizarre case of a malfunctioning female sex droid that has murdered its owner. As they delve deeper into the investigation they are forced to confront violent Yakuza thugs, devious hackers, influential government bureaucrats and powerful corporate criminals. Painstakingly created by Production IG and director, Mamoru Oshii (G.I.T.S, Avalon, Patlabor) Innocence seamlessly combines groundbreaking 2-D and 3-D CG animation techniques to produce an action-packed, sci-fi fable of a solitary cyborg struggling to retain what's left of his humanity in a world where the human soul is gradually fading into obscurity.