USA Weekend mag from Sunday Paper: 2 free 5x7 HP photo cards coupon

The USA Weekend magazine from my Sunday paper has a coupon for 2 free 5x7 HP photo greeting cards, no purchase necessary.  The coupon also says that photo kiosks are at Walmart, HEB photo, Meijer, Duane Reade.  There's a limit of one per customer/per household stated on the coupon.