the one store that sells 3 packs for $4 and the other store sells 2 packs for $3.The store that sells 3 packs for $4 is better to buy.The one reason is each pack has 4 m,so the one that 12 m is just 1 more dollar than 2 packs for $3.And the 2 reason is 12 is greater than 8.