As one of its daily deals, That Daily Deal offers the Energizer Max Alkaline C Battery 24-Pack for $17.99. Coupon code "ENERGIZERMAX" cuts it to $14.97. With free shipping, that's 62 cents per battery and the lowest total price we could find for this quantity by $9.
Want to stock up? Add two 24-packs to your cart for $29.98 before the above coupon, $24.94 after. With free shipping, that's 52 cents per battery and a price low for 48 batteries by $23. Deal ends August 4.