From now through 12/26 Staples is running a promotion on Duracell batteries: Buy one 20ct pack for $12.99 and get all your money back in the form of Staples Rewards. The limit on this deal is 2 per week! So you can get up to 40 free batteries every week. If you are shopping today 12/18 you can use this 10% off coupon for additional savings.
Thanks Money Savings Madness!