Not bad of a deal, Publix has a buy two get one free promotion on 2L Diet Coke bottles.. Regular price is $2.69 for one.. Score this diet coke deal at $1.98 ea. Coupons are not stackable with this deal. Best price we found is at Walmart, they are selling their 2 liter coke diet bottles for $1.49 ea. Target has them priced at $2.29. B2GO Offer is while products last.