Customers HATE when they finish shopping, go through the checkout process, and then when they hit submit, they find out a product they want is out of stock. Not only does this frustrate them, but it leads to complete cart abandonment because the customer doesn't have any idea of when that product will be available again.

In-Stock Notification by Solid Cactus solves this problem, and saves your sale. In-Stock Notification is a custom feature placed on a product page to allow customers to leave their email address so they are automatically notified as soon as the product is back in stock, perfect for getting customers back to your store.