Deals expire for many reasons, usually because the price increased or the product sold out. In some cases, the deal may still be available.
Brad's Deals Editor Tom,
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This 72-Count Box of AmazonBasics AA Batteries is on sale for $15.99 at Woot. Shipping is free with an Amazon Prime account or when you sign up for a free Prime trial. Otherwise, it adds $6. Other retailers are charging $37 or more for comperable batteries! They have a 10-year shelf life.