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GOG has two promos going on. A Blitzkrieg 10th Anniversary special promo and PID is the Indie Gem Promo for the week.
Blitzkrieg Promo
Blitzkrieg Anthology = $3.99 (60% off)
Blitzkrieg 2 Anthology = $3.99 (60% off)
Promo ends on Monday, April 1, at 4:59AM GMT.
Indie Gem Promo
PID = $3.99 (60% off)
Ends on Thursday, March 28, at 10:59AM GMT