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GOG just annouced they now support Mac OS X and they’ve put up a Weeklong Promo for some titles that work for both Mac & PC. Up to 50% off. The deal ends on Friday I believe.
The Witcher: Enhanced Edition = $4.99
SimCity 2000 Special Edition = $2.99
Theme Hospital = $2.99
POSTAL: Classic and Uncut = $2.99