Print this $1/1 coupon and take it to your local Target for free Rayovac batteries.
I have seen them near the dollar section in the front of the store.
It is a PDF file, so you can save it to your computer and print as many as you want. You can also crop the print area in Adobe so that you don't waste ink on portions of the coupon that you don't need.
Think 72-hour kits and year supply!!!