Diet Coke Plus + 12 oz Can. What happens when you take the great taste of Diet Coke add vitamins and minerals? Diet Coke just got friendlier, welcome to Diet Coke Plus +. Each 12 oz Can contains over 20% of daily value for Niacin, B6 and B12. Comes in 12 Packs. Diet CokeIt just got better.About our Pricing. Our $5.57 price is the combination of $4.39 for the product, and it costs us on average $1.18 to deliver each one with fuel, truck and labor. So that's how we get our price, $4.39 + $1.18 = $5.57.