How much less? In March, I launched an epic shopping spree with my husband, Bill, to find out. We checked prices on 100 different items at seven stores—everyday basics, small appliances and more. Then I compared these brick-and-mortar prices with the lowest ones I could find from major retailers online, excluding no-name stores and third-party sellers on major sites. I found that the cost of items at off-price retailers tended to be from 20 to 50 percent lower than the best online prices. Some discounts topped 60 percent!