Amazon has this 2-pack of Duracell rechargeable batteries for $11.58 when you choose the Subscribe & Save
option and click the "Clip this coupon" button on the page, found under the price. Shipping is free. You can cancel the subscription after your order ships. Each pack comes with 4 AAA NiHM rechargeable batteries that you can recharge up to 1,000 times. PCRichard
has these same batteries for $14.99.