Amazon offers downloads of Far Cry 3 for Windows
bundled with a $5 Amazon Editor's Choice download credit
(good for an Editor's Choice game download in January) for $37.49
. Assuming you'll use the credit, that's the best price we could find for a download elsewhere by $18, outside of the price below. (We saw it shipped with a $20 Dell gift card for $50 a month ago, since expired.)
Don't need the credit? Steam sells it for the same price without the credit.