Amex Offers just introduced a great new deal for select cardmembers. When you enroll your eligible card, you can get a one-time $25 statement credit on a qualifying in-store purchase at Costco by August 15, 2014. Qualifying purchases exclude gas, travel and online purchases.

Unfortunately, this is a targeted offer and not all cardmembers are eligible to participate. To see if your card has this offer available, you’ll need to log into your AmericanExpress.com online account and check the “Amex Offers For You” tab. If the offer is listed there, click the “Save Offer” button to register for the promotion. This promo is not currently available through other channels, such as Twitter or Facebook.

Update: Another great reason to check your Amex online account for offers is another new targeted promo: Get a one-time $10 statement credit by using your enrolled Card to spend a total of $10 or more online at Amazon.com by August 31, 2014. Like the Costco promo, the Amazon.com offer is only available on the “Amex Offers For You” tab to select cardmembers after you log into your AmericanExpress.com account and is not available through Twitter or Facebook.

For a list of currently available Amex Offers available through Twitter to anyone, see this page.