$10 reward when you collect codes from 3 specially-marked packages of Energizer batteries or flashlights.
Purchase the specially-marked products and then enter the codes online to get your choice of a $10 pre-paid Mastercard, $10 via PayPal, or a $10 donation to the National Park Foundation.
Remember to watch for sales and use coupons during your battery stock-up and save even more. You can do this rebate up to four times (for a total of $40) per household. Offer ends 12/31/11.