Amazon offers Prime members the Energizer Industrial AA Alkaline Batteries 24-Count 6-Pack (144 batteries), model no. EVEEN91, for $24.18 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $9.19.) That's the lowest total price we could find by $28. They hold their power for a purported 10 years when not in use.

Note that this item is temporarily out of stock, however it can be ordered at this price and will ship when available.