Check your American Express card offers for the Marriott Bonvoy of $50 statement credit on most Marriott Bonvoy bookings $200+. This includes over 30 of Marriott's brands in the US, Mexico, Canada & Caribbean. Add it and use this card to book directly. This expires on September 21st but to be safe, make sure your payment at Marriott gets processed by then.
Marriott Bonvoy [marriott.com]
Charge must be processed by September 21, 2020 for Statement Credit
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