A sold-out product page normally loses the sale twice — once now, and once when the customer forgets you. This module puts a "Notify me when available" form next to the unavailable add-to-cart button, stores each request in its own table, and lets a cron URL do the rest: it looks for subscribed products whose quantity has climbed back above zero, mails everyone waiting with your own subject and body copy ({product} and {link} placeholders included), and marks the row sent so nobody is mailed twice. Out of stock is decided by real data — quantity at or below zero, plus any stock statuses you nominate — so pre-orders and backorder statuses behave the way your shop expects. Admin gets a per-product waiting list with counts, one-click delete, and a spreadsheet-safe CSV export. Addresses are validated, unique per product, and the form is throttled per session so the endpoint cannot be turned into a mail spool. Uninstalling the module leaves the subscriber table exactly where it is.