Icewind Dale: Enhanced Edition is on sale now through the Beamdog store for 50% off ($9.99). You get both the Windows and Mac versions of the game with one purchase.
http://www.beamdog.com/products/icewind-dale-enhanced-edition
Sale ends May 11, 2015.
http://www.beamdog.com/products/icewind-dale-enhanced-edition
Sale ends May 11, 2015.