How to scrape Quantity

I don't know how to pull  in quantity from this website and where to place the  value into the  crawlomatic settings. Link: https://thejerseysource.com/collections/pro-football/products/jason-witten-autographed-dallas-cowboys-f-s-flat-white-speed-helmet-beckett-auth-blue Also, if the item runs out of stock on the  source website, how do I update my website to be out of stock?