Update: you have to manually select "buy from Amazon" to choose Subscribe and Save. A 20 Pack of AA Duracell Coppertop Batteries falls from $17.13 to $9.97 at Amazon.com. Scroll down the page and click "Clip This Coupon" to drop it to $9.22. Choose "subscribe and save" to cut the price to $7.72 with free shipping, the lowest price we could find by $16. Note that once you receive your order you'll have to cancel your subscription to avoid automatically placing future orders. There is no sales tax (except in KS, KY, ND, NY, and WA).