Lowe's offers the Utilitech Alkaline AA Battery 30-Pack
(two 15-packs) for $4
, that's $0.13/battery, $6 off list, and the lowest total price we could find. (We saw a 48-pack of Utilitech AA batteries at the same per battery price, last November.) Sales tax is added where applicable.
Update: They've since sold out for shipping, but may still be available for pickup at your local store.