This is a company that usually works with other companies to get deals on prescriptions (US based). At the very least, it can show you where the cheapest price is within a certain radius of your home. I don't know if your company MUST be participating in it, or if anybody can use it.
Not everything is in the database, but it can help.
Rx Comparison Tool
Not everything is in the database, but it can help.
Rx Comparison Tool