Woo In-Stock Notifier
Customers come and go on your online store when they found that the product they want, isn’t in-stock. In that case, the customer will be disappointed and will try to find out the same product on another website, even though that product is selling with the higher price than yours.
Get the plugin from the WordPress.org
Click Here to know more about the plugin.
Please raise issue or sent Pull Request if you find any bugs in plugin.