Snapfish has Free 100 4″x6″ Digital Prints a Month for One Year if you use its mobile app to upload and order prints. This is valid every month for a year, which adds up to a total of 1200 prints. In addition, you can currently get free shipping with coupon code SHIPAPP. Here is a screenshot for your reference, which shows the 100 free prints and the free shipping. Details are available here.