hi Steph,
Here's more info regarding The Honest Company Diaper Cake.
http://costcocouple.com/the-ho...
By the way, regarding The Honest Company Shampoo and Body Wash, the easiest way to find out for sure if a Costco carries this item to to call up your local Costco and ask if they carry item#755666, which is the item number for The Honest Co Shampoo & Body Wash.
You can possibly save yourself a trip this way.
Hope this helps,
Olli