If you have a baby, then you are buying lots of Pampers and Huggies products, which all have codes on them. Here are some free ones I found to get this started.
Pampers Village
JOINNOW4REWARDS
WELCOME2VILLAGE
GIFTSTOGROW4MOM
2BEGINEARNING50
Huggies Enjoy the Ride
Pampers Village
JOINNOW4REWARDS
WELCOME2VILLAGE
GIFTSTOGROW4MOM
2BEGINEARNING50
Huggies Enjoy the Ride