Shop4Tech offers the Tenergy Centura NiMH 800mAh Rechargeable AAA Battery 12-Pack for $15.48. Coupon code "MISS17" cuts it to $12.85. With free shipping, that's $1.08/battery, tied with our March mention, and the lowest total price we could find by $6 (outside of the mention below). Coupon expires June 26.

A close price: Battery Superstore via Amazon offers this quantity for $13.38 with free shipping via Amazon Prime. (Add three 4-packs to your cart to get this price.)