Bonus: If you buy Huggies or Pampers (Get 100 pts for signing up for pampers rewards) you can participate in their rewards program using the points you accumulate from inside the packages; both of them have freebie points that get passed around the web.
Publix sign up to get coupons for free baby stuff (Publix is only in 5 states; Florida, Tennessee, South Carolina, Alabama, and Georgia)
Toys R Us- Coupons, birthday card, instore celebration
Mom Ambassador- Become a mom ambassador receive free products to share with other moms
Amazon Mom-Have you signed up for Amazon mom yet, why not it's free!? when you do you get Free Amazon Prime 2 day shipping on everything not just baby items for 3 months, then for every $25 you spend on specialty baby items (like wipes and diapers) you get another month free! Plus you get 30% off and if you get automatic shipping (subscribe&save) on diapers it ends up being like $30 a box