Amazon has Duracell Batteries AA, 20 pk, for only $8.47 ($.42/each)  It is on sale for $9.97 but you can save an additional 15% off with Subscribe & Save which will bring it down to $8.47, Shipped!

Subscribe & Save is a Free Program that you can have an item shipped to you frequently.  You can choose Subscribe & Save to take advantage of the savings and then cancel at any time.

This will ship for Free with Super Saver Shipping with orders of $25 or more. You can upgrade your membership to Amazon Prime and get Free 2-Day Shipping.

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