Right now, through April 6, Kroger's has an online game where they are giving away over 80,000 prizes!!! You'll need to register and add your kroger's card to play. So far I have won a FREE oscar mayer lunchable and a king Reese's peanut butter cup!! The winnings are automatically loaded to your card. So get to it, you have nothing to lose by trying.
Also, after you're done, you can upload digital coupons to your card that you can use in conjunction with manufacturer's coupons you take to the store with you for even more savings!!!