Did you google it?
Yep. And I came up with this which gave me concern (scroll down to the Drug Discount Cards section. Also, I had other hits of people questioning these cards, so I decided to ask FReepers if any on our forum had any experience with them.
My major issue is, how does the drug company recoup the difference after the discount? Not that I'm in love with drug companies, per se, but the idea of free cards offering major discounts seems pretty scammy to me.