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GOG has the Arma Series on sale for a special promo stacking deal.
Buy all three games for 80% off or buy each game for 60% off:
Arma: Cold War Assault $1.19 / $2.39
Arma Gold Edition $1.99 / $3.99
Arma 2: Combined Operations $4.99 / $9.99
Deal ends Saturday, June 7th.