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We have a new mobile coupon you can request! This one is for $1 off any Diet Coke purchase. Simply text DIETCOKE to 827438 to have this coupon sent straight to your mobile device. Coupon valid through 9/10. Stack this with the 50% off Coca-Cola Cartwheel offer to pick up a 2 L bottle of Diet Coke for only $.39 through 5/21.