They are clearing out the Plum Organics 12 pack baby food pouches for Sprout brand. This is likely a manager's decision to discount so low, but I figured I'd share anyway as multiple Costcos will be clearing out the same product.
Typically these go for around $1 each pouch, so $0.33 is a steal.
Online price is not discounted:
Picture from my local Costco (70508) is attached to this post.