Amazon has the 28-Pack of Duracell Optimum AA Batteries (Resealable Package) for $26 - 5% off with Subscribe & Save (can cancel anytime) - 30% off coupon (check “Save an extra” box, eligible on first S&S order for this product) = $17 with free shipping on $25+ or with Prime.
Amazon with Amazon Warehouse has the 18-count Duracell Optimum AAA Batteries for $8.24 with free shipping on $25+ or with Prime.
Amazon has the 6-Pack of Duracell Optimum AA Batteries for $3.23 with free shipping on $25+ or with Prime.
Home Depot has the 6-Pack Duracell Optimum AAA Alkaline Batteries for $3.08 with free shipping or store/curbside pickup. Includes a resealable storage tray.
The 24-pack (AA) is $20 with same code and 100% back in Office Depot Rewards.