Running a growing WooCommerce store comes with its own challenges. When your store becomes popular, you need to keep a closer eye on your inventory and transactions to keep customers happy. With Woo Out Of Stock Products, you can quickly give your visitors heads up when products are out of stock.
This plugin applies an image overlay to all product images that are out of stock. You can use the images included with the plugin or add your own on the settings page. This is a free script.