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GOG has a Gem Promo deal going on for the next 48 hours. The Witcher Series is on sale for 50% off. However, if you purchase both or complete the set you’ll get the games for 66% off.
The Witcher: Enhanced Edition = $4.99 (50% off) / $3.39 (66% off)
The Witcher 2: Assassins Of Kings = $19.99 (50% off) / $13.59 (66% off)