If my math is correct, you are missing out on a great D.R. bargain.
Pricesmart: 28.52 pesos per Frank - 59¢ U.S. ($4.13 per pack of 7 - U.S.)
.. Walmart: 30.72 pesos per Frank - 64¢ U.S. ($4.48 per pack of 7 - U.S)
A great price considering that´s an available in Santiago price.