Walmart: Buy 1 Get 1 FREE 5×7 HP Print! September 21, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. HP Photo Centers and Walmart just released a great new coupon! Just go here to print a coupon valid for buy one get one FREE 5×7 Prints! FREE photo valued up to $2.27. Expires 10/31/10.