Keep in mind the actual deal has many hotels as low as $90 a night, but they are non-refundable. They claim as low as $79 for members but I haven’t seen one yet. Want to still save but not book a non-refundable?
There is a way. Become a Marriott member (free of charge) and book the Marriott member rate. They are still low prices and in my case, it only cost me $10 more dollars to secure the great same deal, but it can be cancelled! The deals are only for bookings through January 16th (Into March for Europe).
Have something booked already? Book the new rate, then cancel the old reservation with the higher rate!