CVS Pharmacy must rely on prescription drug sales to keep in business, but Wal-Mart doesn't need to add a huge markup to the prescription drugs they sell. The local temperature from the medicine producing country is one as well as the other country may be another, as well as the avian temperature is the other. Make certain that you take some time to ask about a less expensive version so that they will look at the list. http://lsdsng.com/node/4173