I think it's a case of following suit.
In this area (Northern Virginia) I've seen signs at Wegman's, Giant, Safeway, and if I'm not mistaken Wal-Mart offering the same free 14 days worth of antibiotics at their Pharmacies.
When Wal-Mart started their $4.00 prescriptions, most of the other store pharmacies followed to keep up. I think that might be what is happening here.
I'm not a fan of some of Wal-Mart's practices, but the one subscription that used to cost me $90.00 a month now only costs me $4.00 and that was forced on the local store because of Wally.
"Learn survival skills when your life doesn't depend on it."