SONY
Spend $300 or more, get $50 back
Valid until 17/05/2019
Save the offer to your eligible Card and spend $300 or more, in one or more transactions, online or in-store at SONY by 17/05/2019 to receive one $50 credit. Limited to the first 40,000 Cards to save the offer. Exclusions apply.
Doesn't seem to be up on the Amex Offers page as yet, but was available to save on my account page.
Direct link here