Sanyo Eneloop Rechargeable AAA Batteries (4-Pack) for $5.85. Shipping is $3.35 for a total of $9.20 shipped. Here is a screenshot for your reference. Alternatively, this rechargeable batteries is also available at Amazon for $8.98 with free shipping for orders over $25. It features 800 mAH power, and recharges up to 1500 times with batteries maintaining 75% charge after 3 years of non-use.