Walgreens: 20 FREE 4×6 Prints March 21, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Register with Walgreens photo center by March 29th and you will have until March 31st to claim 20 FREE 4×6 prints. Go here to register. Enter code 20FREE4×6B at checkout.