It is important for Videoly to understand, when the product is not available for purchase. It helps to provide more accurate statistics and also to prioritise curation process in favour of products, which are in-stock. Current selectors help to set the condition, when the product is in stock. For example, often product can be in stock, if "Buy"-button or label "in-stock" exist. With the selector it is possible to choose any element on the page, which is shown, when the product is in stock. Also, it is possible to check, whether the selected node's value equals to some particular value. And, if so, product will be considered as in-stock product.