@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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The Last Guardian
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In a strange and mystical land, a young boy discovers a mysterious creature with which he forms a deep, unbreakable bond. The unlikely pair must rely on each other to journey through towering, treacherous ruins filled with unknown dangers. Experience the journey of a lifetime in this touching, emotional story of friendship and trust.
The Last Guardian is the third game by the acclaimed development staff behind ICO and Shadow of the Colossus. In the game, a young boy and a bizarre, gigantic creature form a heartfelt bond as they attempt to maneuver their way through an unfriendly world.