Where do you find e-commerce products to sell?

Hello. There is a site called printify.com. It allows us to sell products such as clothing, household goods, etc., by drawing a sticker on them. The only problem is that the data of out-of-stock products is not automatically taken with woocomerce. For example, when a product is out of stock, it is displayed as in stock on my website. Do you know of such a site that works seamlessly with Woocomerce?