(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
GOG has a release special promo up for Mark of the Ninja. The game is on sale for 66% off until Friday, August 8th.
Mark of the Ninja $4.99
Mark of the Ninja Special Edition $5.99
Mark of the Ninja Special Edition Upgrade $1.66