The age of digital coupons is about to explode with Target’s announcement that it’s launching a mobile-device coupon program at all of its stores. Shoppers can get digital coupons on their cellphones and redeem them at any Target store in the U.S. by having the cashier scan in the bar code from the phone screen. Register at the Target website, or download the free Target iPhone app. Target’s coupons will have an expiration date and can be used only once. The store will issue new coupons each month as....

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