Today only, Shutterfly offers Unlimited 4x6" or 4x4" Digital Photo Prints for free. (They usually cost 15 and 25 cents per photo, respectively.) For quantities of 250 or less, shipping costs $1.79 for your first print and then adds 8 cents per print for each additional print you buy. (For quantities of 251 or more, shipping adds $21.74 and then 3 cents for each additional photo.) That's the first unlimited free prints offer we've seen from Shutterfly; usually, the free offer is capped at around 100 photos.