If you don't have a Snapfish account create one first at snapfish.com & upload some pictures you want printed then:
click on this (before ordering anything!):
enter c717nr for the HP PC model #
enter 0000000000 for the HP PC serial # (10 zeros :) )
and you will get 100 free prints!
Then, at check out, enter hpfreeship778 and you will get FREE shipping! I just did it and it worked exactly like the post says it does.
(Snapfish is JUST like shutterfly so don't worry about signing up, there are no hidden fees)