EXPIRED – Free Nature Valley Wafer Bars at Meijer July 26, 2019 by moneysavingduo Have mPerks? You won’t want to miss this weekend’s freebie offer on Nature Valley Wafer Bars. If you have an mPerks account you can clip a manufacturer’s coupon for Nature Valley Wafer bars. The coupon is valid on all 5 ct. varieties. Don’t have mPerks? Download the app and start saving on groceries today!