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Update: Some offers mentioned below are no longer available – The Amex EveryDay Preferred Credit Card from American Express
American Express cardholders with access to the Amex Membership Rewards program can earn double the points on Amazon purchases now through July 31. The promotion is available through Amex Offers, which you can access by logging in to your American Express account online.
Some members of the TPG Team had issues finding the promotion immediately, so it might be helpful to visit Amex Offers directly to enroll with this particular promo. Typically the discounts are simply a statement credit, but often you’ll get the chance to earn some bonus Amex Membership Rewards points. Note that in order to be eligible, you must enroll in this offer before making purchases on Amazon.
The promotion is available on purchases made through July 31, and points will post within 90 days of that date. You must register each individual card you plan on using directly through American Express. Moreover, you can earn an additional 0.5 points per dollar spent with the Amex Everyday Preferred Credit Card, which offers 50% more points when you make 30 or more purchases in a billing period.
H/T: One Mile at a Time