UPDATE: The coupons just went live. Go and Like American Family Insurance on Facebook, then click on 9 V coupon. I can't get the pages to fully load. Looks like there are only 1,000 coupons available!
You may want to go here and "like" Rayovac on Facebook. They announced that they would be giving away free 9 volt batteries in honor of it being Fire Prevention month. Since then their server crashed from all the people running over there. The coupons are not up yet, but they should be soon, so I would keep checking back if you can. There is supposed to be a 9V Coupon tab where you can request your free batteries but it isn't up yet. These will probably go quick!