I'm sure you've been in the same situation. You go to a shop and see something you would like to buy. For whatever reason, you don't buy it at that moment, but when you come home you look up the same item on the store website. The surprise is that you cannot find a product that you saw with your own eyes in that shop just a few hours earlier.
How can this be? Perhaps the shop doesn't make all their products available in their online store. But since the product is on sale, you would think it reasonable to describe it on the website and state it is available in-store.