DealYard via Rakuten offers the Duracell AAA Rechargeable Stay Charged Battery 6-Pack, model no. DX24B6TB, for $8.50 with free shipping ($1.42/battery). That's the lowest total price we could find by $4, although we saw it for a buck less in our August mention. These pre-charged 800mAh AAA batteries purportedly retain power for up to 365 days while not in use. Deal ends October 17.