It shouldn't be an error. Free is and always has been this game's price. It was just hidden behind a mandatory dlc purchase (like Smite 2 (currently), Predecessor (during Early Access) until the full release, like it said in the announcement. Pretty sure it's free forever now - https://store.steampowered.com/news/app/2818260/view/6903544142289009644
Might give it a shot though now but the reviews don't look too promising. Some complain of dead player base (maybe will be helped with f2p), bad pc port, and just not as complex as Tarkov.
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I'm not sure is error or not? In the mail says 50% off but it's Free to Play...
https://store.steampowered.com/app/2818260/Vigor
End at 19 Sept 10 am PDT
EDIT:
Game is F2P and DLC is 50% discount.
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