Today only, 20% off on any game on Big Fish; the only games not included in the sale are Free-to-Play games. Use the coupon code ONEDAY at checkout.
Sale prices break down as follows:
Game Club members: standard version games - $5.59, Collector's Editions - $11.19
Non-Game Club members: standard version games - $7.99, Collector's Editions - $15.99