Amazon offers Prime members the Silicon Power AAA Performance Alkaline Batteries 40-Pack, model no. SPAL03ABAT40PV1K, for $9.49 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.83.) That's $2 under our mention from four days ago and the lowest price we could find by $3. They have a purported shelf life of seven years.