It’s the Optimum batteries. .
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Bonus Rewards: 100% back in Rewards on Duracell Optimum AA/AAA 12PK and 18PK valid only at officedepot.com and in store from 9/26/21 to 10/2/21 11:59 PM ET or while supplies last, whichever occurs first. Rewards are limited to 2 items per member. This offer cannot be combined with other Bonus Rewards offers on the same or similar products and services.