A. Check offer in your Amex account. If not there, Sync: BestBuy
B. From Twitter: tweet "#amexbestbuy" to add the offer to your synced
Amex Card
C. Make sure you get an "@ reply" message from @AmexSync
Make a purchase of $250+ at Best Buy by 9/30/2015
D. A statement credit should be issued within 90 days after 9/30