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GOG has a release Special Promo deal for the STALKER series.
Buy all/complete the set for 70% off. Otherwise it’s 50% off each.
S.T.A.L.K.E.R.: Shadow of Chernobyl $6 / $10
S.T.A.L.K.E.R.: Clear Sky $3 / $5
S.T.A.L.K.E.R.: Call of Pripyat $6 / $10