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Smoothie King is encouraging better meal choices with a Fast-Food Coupon Swap. Now through October 15th, present any digital or physical coupon from another quick-service restaurant at checkout, and Smoothie King will knock $2 off your smoothie. The Fast-Food Coupon Swap is valid on smoothies 20 oz. or larger and limited to one coupon per guest per visit and cannot be combined with any other offer.