Wal-Mart Stores Inc. said Wednesday that it is offering a 30-day free trial of ShippingPass, its service that provides unlimited two-day shipping. The service is normally $49 per year. Customers who are already members will receive an additional month for free. ShippingPass was launched in May. Wal-Mart shares are down 0.2% in premarket trading, but up 16.7% for the year so far. The S&P 500 is down 0.4% for the year to date.
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