American Express is currently offering on select cards, $20 back on a $79+ purchase at Walmart.com. Enrollment is limited. Credit valid until 12/31/13.

Not sure what to buy? You can always buy a $79 physical gift card or a $79 eGift card to be used at a later date, while locking in the $20 statement credit.

To see if this offer is available for you, click on “Offers For You” which is under you account summary on your online American Express account. There is no rhyme or reason to which accounts have this offer. If the offer doesn’t appear under your first card account, keep checking the other accounts. Once you find the offer, be sure to click “Save Offer”.

• Valid online only. In store transactions are excluded.
• Enrollment limited.
• Offer is non-transferable.
• Not valid on gift card reloads and prepaid cards.
• If you order an item during the offer period but it is not sent to you until after 12/31/13, it may not count towards determining whether your purchase qualifies for the offer.
• Limit 1 statement credit per American Express Card across all American Express offer channels.
• Statement credit will appear on your billing statement within 8 weeks after American Express receives information from the merchant about your qualifying purchase.