@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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Briggs Land Vol. 01: State Of Grace (TP)
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Briggs Land, nearly a hundred square miles of rural wilderness, contains the largest antigovernment secessionist movement in the United States. When matriarch Grace Briggs wrests control of the operation from her incarcerated husband, she sparks a war within the community-and her immediate family-that threatens to bring the full power of the federal government down on their heads. Collects issues #1-#6 of the series.