Amazon has the 200-Pack Amazon Basics AA Industrial Alkaline Batteries on sale for $39 - 10% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $33 with free shipping (extra 5% off for 5+ S&S orders). Roughly 16 cents per battery. 5-year leak-free shelf life.