Powdered milk may be less expensive at suburban stores. Check the Prices at Specialized Meat Markets and Wholesale Stores. Sometimes, shops which only sell meat or deli items may have lower prices than supermarkets. Wholesale stores or big discount markets may also have some deals, compare prices carefully. Don't Shop in a Hurry.
Good shopping takes time.
You'll want to compare prices, check out more than one store, etc. In this case, time really is money, because you're using your time to save you money. Watch Out for Non-food Items. Buy Bread at Bakery Outlets. Avoid the high priced bread section at supermarkets.