PetSmart, Babies R Us, Toys R Us, and many others are included in the list of ship for free & return for free!
There is a members benefit section that gives addition discounts.
& another bonus?? Yup - you can use this in combination with ebates.
It's worth checking out and seeing if it will work for you.
http://www.shoprunner.com/invite/a0QG0000004c1AwMAI