Martin’s Food Markets is a chain of supermarkets in Maryland, West Virginia, Pennsylvania and Virginia and the majority of stores are open 24 hours, seven days a week. In most stores, one like coupon will be doubled with a face value up to $0.50 and coupons up $0.99 are rounded up to $1.00 when you use your Martin’s Bonus Card. Sales are very similar to Giant and Stop & Shop and run Sunday through Saturday.