Target is having a great deal for shoppers that use Target Mobile Coupons. Starting August 7th, all 2-Liter Coke items will be on sale for 5/$5 or $1.25 each. If you get Target Mobile Coupons, you can use the $1 off 1 Diet Coke (text DIETCOKE to 827438) coupon. Final cost for a diet coke is 25 cents!