Shop4Tech offers the Tenergy Centura NiMH 800mAh Rechargeable AAA Battery 12-Pack for $17.88. Coupon code "AE20" cuts it to $14.30. With free shipping, that's $1.19/battery and the lowest total price we could find by $5, although we did see them for a buck less in June (since expired). Coupon expires August 26.

Also available is the Tenergy Centura NiMH 2000mAh Rechargeable AA Battery 12-Pack for $23.88 before the coupon above, $19.10 after. With free shipping, that's $1.59/battery and the lowest total price we could find by $6, although we saw them for $3 less in May.