Amazon offers the Maxell AA Alkaline Battery 48-Pack, model no. 723443, for $12.37. Add it to your cart via Subscribe & Save and it falls to $10.51 with free shipping. That's 22 cents per battery, and the lowest total price we could find by $5, although we saw them for a buck less last week (since expired).

Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.