@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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Uncharted 4: A Thief's End Collector's Edition Guide (HC)
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The Uncharted 4: A Thief's End Collector’s Edition Guide includes...
Only in this Collector's Edition: Pirate Sigil Coin - Silver Variant - An important artifact from Nathan Drake’s latest adventure, this silver-colored Pirate Sigil Coin is exclusive to this Uncharted 4 Collector’s Edition Guide.
Detailed Maps: Confidently run, jump, climb, grapple, and shimmy from one point of interest to the next using our maps, which show detailed traversal routes for every challenging area in the game.
Find Every Treasure & Collectible: This exhaustive guide reveals every collectible treasure, trophy, weapon, journal entry, conversation, and more.
Complete Story Walkthrough: Our step-by-step walkthrough leads you through the entire adventure, providing stealthy alternatives to advance more efficiently and earn special Trophies for sneakiness.
Adventuring School: Learn everything you need to know about navigating the environment, combat, weapons, vehicles, treasure hunting, and more!
Plus enemy and weapon data, multiplayer coverage, treasure and trophy checklists, and character profiles!
Free mobile-friendly eGuide! Includes a code to access the eGuide, a web-access version of the complete guide optimized for a second-screen experience.
These limited edition guides will only be printed once. When they are sold out, they will be gone forever!