The Walgreens Photo site is offering up a FREE 8×10 Photo Print (a $3.99 value!) when you use the promo code 8X10SMILES at checkout. The end date on this is unknown.
Be sure to select FREE in-store pickup to save on shipping.
Keep in mind that this coupon code is limited to one use per Walgreens.com account and to one free 8×10 single-image print per household.
Also note this won’t work on the mobile app!