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"Now this isn't the first time the retailer has jumped on a consumer health issue in a big way. In late 2006, Wal-Mart started making a slew of generic prescription drugs available for $4 a month. And later, 90-day mail order prescriptions were added. Their price: $10.

There was some skepticism at the time. But Wal-Mart's move to offer generic drugs at such cheap prices prompted other retailers, including Target, to bring down their prices, too."

Wal-Mart Food Push Echoes Earlier Move On Generic Drugs : Shots - Health News Blog : NPR