Amazon has the 48-Count Powermax AA / AAA Alkaline Batteries Combo Pack (24 of each) on sale for $15 - 15% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $11.64 with free shipping on $35+ or with Prime. Roughly 24 cents per battery.