It was nice while it lastet, but the prices are now back to normal (Steam discount level) or the products are not available anymore.
As sonatamyasa has shared in his comment this situation has indeed been a pricing error, due to a misunderstanding between the Shops and the Publisher.

Shadow Warrior 3 - 90% OFF @ $3.99:
https://www.wingamestore.com/product/13265/Shadow-Warrior-3/
https://www.gamebillet.com/shadow-warrior-3
https://www.fanatical.com/en/game/shadow-warrior-3

Trek to Yomi - 85% OFF @ $2.99:
https://www.wingamestore.com/product/13359/Trek-to-Yomi/
https://www.gamebillet.com/trek-to-yomi
https://www.fanatical.com/en/game/trek-to-yomi

Serious Sam: Siberian Mayhem - 80% OFF @ $3.99:
https://www.wingamestore.com/product/13260/Serious-Sam-Siberian-Mayhem/
https://www.gamebillet.com/serious-sam-siberian-mayhem
https://www.fanatical.com/en/game/serious-sam-siberian-mayhem

EDIT 3: Added WinGameStore Links; GameBillet and Fanatical are Sold Out; Added Steam links for reference, as devotee did in the comments.
Thanks to spodamayn, LordHamm, OneManArmyStar and everyone else for keeping this updated!
EDIT 4: Deals have expired

Honorable Mention:
Weird West was also quite cheap @ 75% OFF for a game released this year.

2 months ago*

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Drats. Missed it travelling 2 days.

2 months ago
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It happened and was over 6 days ago though.

2 months ago
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I wondered why so many giveaways for these.

2 months ago
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What are you even talking about? There has been one public giveaway for Shadow Warrior 3, two group giveaways for Serious Sam: Siberian Mayhem and none for Trek to Yomi and Weird West since this price glitch happened.

2 months ago
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Sorry. I jumped the gun. Should have said "Can't wait to see all these giveaways" They'll pop up eventually.

2 months ago
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Ok, that makes more sense. ^^

Not sure if there's really so many more to expect though.

2 months ago
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