This final tip could save you up to 10 percent on your favorite items (including wine!), but involves a little frontloading. If you buy a case of a product you can save 10 percent. (The exact quantity that comprises a case is determined by each manufacturer, but typically means 6 to 12 of a particular item.) To score this discount on wine, for example, shoppers need to purchase six bottles. The case discount also applies to rice, grains, and produce, though these goods can only be discounted if you buy 15 pounds or more.