For MaxPerks members, OfficeMax offers the Duracell Coppertop Alkaline Batteries AA or AAA 10-Pack for $8.49 and AA or AAA 20-Pack for $14.29. With your purchase, you'll get a free $8.48 or 14.28 MaxPerks Bonus Rewards Credit for use on future purchases. (The credit is applied to your MaxPerks account; if you don't have a MaxPerks account, sign up for a free account before purchase.) You can buy up to two packs. Shipping adds $7.95, or spend over $50 to qualify for free shipping. Assuming you'll use the credit, that's like buying either pack for 1 cent, a very low price (even after shipping for two 20-packs). That said, we saw a very close price yesterday for Duracell AA or AAA 26-packs from Amazon, assuming you have Prime.