They are out of Costco Grocery Bags (large reusable grocery bags)
I looked for Costco Bags at Valencia Costco & Oxnard Costco.
They didn't have them.
I always give out my Costco Bags - people love those bags.
I only have 3 in my trunk and I need more.
I don't know if they are going to re-stock them or if this is the end of it.
Update (January 2017) - Above blog is 7 years old. Now I can tell you that Costco bags come and go. If you don't see them now, you will see them soon enough. You just need to keep your eyes open. You will find them sooner or later.
Large reusable grocery bags from Costco