Update: Amazon has now switched the wording of the promo offer. The offer now states that you’ll get a $20 Amazon credit with a Subscription to the Economist – and not Reader’s Digest – so either this promo is now dead or it was a mistake to begin with. You can either cancel your order if you don’t want to take the risk of possibly not receiving your $20 Amazon credit, or you can try chatting with Amazon to verify.
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Reader’s Digest – Link

Amazon is offering a 1 year subscription to the Reader’s Digest for $8. Right below the price, there’s an offer showing that you’ll get a free $20 Amazon store credit with your subscription! This means you’ll pay $8 and you’ll get back $20 for a total gain of $12!
Store credit should arrive via email once the first issue of the Magazine ships.

The subscription auto-renews, so if you don’t want another year, you can easily change this by going to the Magazine Subscription Manager under Your Account, and de-selecting the auto-renewal option for your magazine subscriptions.