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GOG has three Special Release Promos running that come with pretty big discounts.
Hearts of Iron 3
Buy both titles for 75% off otherwise it’s 66% off each.
Hearts of Iron III $2.49 / $3.39
Hearts of Iron III: DLC Collection $7.49 / $10
Deal ends 8/4.
Ziggurat $6 – Deal ends 8/6.
Retro City Rampage DX $3 – 70% off until Friday 7/31. After that the game is on sale for 50% off until 8/5.