Valid through 12/31/2014 (hurry to register as this one won’t last long!):
Amex has a new Sync offer for $10 off any $50 or greater purchase at OfficeMax or Office Depot.
Use your enrolled Amex card to spend a total of $50 or more in-store or online to get the $10 statement credit.
To enroll via Twitter, sync your card and then Tweet: #AmexOfficeDepot
Important, please first read this post: Maximizing Amex Sync offers. Part 1: sync multiple cards.