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The game is being sold for 171,79 bucks right now while on Steam the price is mearly 50 bucks.

As far as I can tell there is no special edition and only 1 DLC for Soundtrack.
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I know the OP talks about a very crazy Brazilian price difference, but just wanted to chip in that the UK prices are odd too (but not to the same level).

£24.59 on GOG, and £21.00 on Steam, something like a 15% difference. Anyone have a clue as to why?