@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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Hellboy Into The Silent Sea (HC)
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Hellboy sets sail from the wreckage of a deserted island only to cross paths with a ghost ship. Taken captive by the phantom crew that plans to sell him to the circus, Hellboy is dragged along by a captain who will stop at nothing in pursuit of a powerful sea creature. Following the events of Hellboy: The Island, Gary Gianni draws Hellboy in a brand-new graphic novel.