Amex offers: Starbucks, save 15% every time, up to $5 By admin | September 1, 2018 11:04 am EST 0 Comment https://www.americanexpress.com/ offers select American Express Cardholders: 15% back as a statement credit up to $5. Valid in-store, at stand-alone Starbucks locations, and for app reloads. Offer ends 10/15/18.