By popular demand we have today introduced configurable email stock alerts. In your product screen, scroll down to the product alerts section and set the desired level. Each time your stock descends through that level whether, from a sale or even a manual stock adjustment by your team, you will receive an email or emails to the individuals specified on the email template which is automatically added to your system when you set up your first product level stock alert.
You can also set stock alerts at the same level system-wide by setting your level at the top of the product screen.