WooCommerce - Waitlist v2.2.5

Keep customers happy with back-in-stock notifications. Automatically notify customers when a product becomes available for purchase. The WooCommerce Waitlist extension lets you track demand for out-of-stock items, making sure your customers feel informed, and therefore more likely to buy. Using a simple plugin, you can build up a waiting list of people wanting the unavailable item, then notify these customers automatically when products come back in stock.