PrestaShop Out of stock notification module ensures that no customer is disappointed due to out of stock status of your product and lets them subscribe for products which are out of stock.
Warning: Last items in stock!
Make the most of your store visitors and customers by allowing them to subscribe for out of stock products so whenever products are back in stock they will receive an automated email telling them that their favorite product is back in stock.
It will also increase customer loyalty and will boost overall sales. Customers can also see their subscribed items in My account page with current status of that item.