Accor’s annual 50% off sale is back for the next few days. Bookings must be made between October 27 and November 1 for A-Club members, and between October 29 and November 1 for non-members. The promotion is valid for stays between December 12 and February 12.
This is about as gimmick-free of a promotion as you’ll find. They take the best flexible rate and charge you half of it. The only catch is that the rate is non-refundable.
Combined with this Flyertalk discussion on how to get free Platinum status in their loyalty program, this is an exceptionally interesting promo.