Through June 30th, Shutterfly has a couple of free offers. You can get a free 20 page 8X8 hardcover book valued at $29.99 or get a credit of $29.99 towards a more expensive book using code: SUNNYBOOK. Shipping for me is $7.99 plus tax.
You can also get 99 free prints using code: 100FREEPRINTS. Shipping is $5.99 plus tax so each print is around 6 cents shipped to your home!