Energizer 4-Pack e2 Rechargeable AA 2450mah Batteries for $5.99 are available at most of Walgreens stores. For your reference, this links to same set of batteries. Most Walgreens stores will have these batteries on sale for $7.99, which is a decent price. There is a $2 peel-off coupon on the package so that your total should come to $5.99. Again, this is available at most stores, but there will be individual store variations.