Hyatt has gift cards at 10% off until 11/24. From the email:

"Gift cards are here for your favorite traveler
From November 17 through November 24, enjoy 10% off your gift card purchase using promo code GPGIFT15."

Not sure if this year AMEX open will still count as extra 5% (or 2 MR pts), but hyatt is leaving OPEN starting Jan 1 2016, so would be last chance if it does.