The drop price alert lets the customers to subscribe/unsubscribe any product they are interested in to be notified when price is dropped.
Customer needs to insert his email. A message template that admin can modify will be sent to customer with full details of his subscribed product.
A schedule task will run to check if any subscribed product price is dropped to send the notification to the customer.
Admin can change the place of the subscribed button based on the widget zones.