Get a FREE Box of Grain Berry Cereal if you're one of the first 9,000 to enter. You'll be mailed one coupon redeemable at a retailer wherever Grain Berry is sold, good for one (1) FREE box of Grain Berry cereal Allow up to six (6) weeks for delivery. Go here then click the CLICK TO ENTER button and enter with either your iHeart, Facebook or Google account.