Use the "Need a code?" option and enter:

UPC: 016500529156 exp: 9/2011 Purchased at: Walmart

Then log into or create your Shutterfly account and add the code under your special offers.

http://www.whatmatterstoyou.com/index1.php?p=shutterfly

If you can use the "ship to Target" option for this offer, you won't have to pay shipping, otherwise, shipping applies.