If you are a Staples Rewards member (free to join!), you can snag free after rebate two 20-packs of Duracell AA or AAA batteries EACH WEEK until 12/26 while supplies last! Now, this is a lot out of pocket, but once you receive your rebate (in the form of a Staples gift card), you can just keep rolling this deal. This would be a great offer for those who use a lot of batteries and those who shop often at Staples.
Click here for more details and to sign up to be a rewards member.