Excluding the effect of deflation in gasoline prices and impact of foreign currency fluctuations, Costco's comparable-store sales for September rose 6%, reflecting a similar percentage increase across both U.S. and international locations. Its strategy to sell products at highly discounted prices has helped in sustaining growth amid beleaguered economic conditions, as cash-strapped customers continue to reckon Costco as a viable option for low-cost necessities. Costco Wholesale Corporation ( COST ) has released with its fourth-quarter fiscal 2014 results today.