<p>Save $30 when you get one of these discounted Ring security camera doorbells.</p> <p>The post <a href="https://www.popsci.com/sponsored-content/ring-battery-doorbell-plus-sponsored-deal/">Ring doorbell low stock alert: Only 140 units left at discounted $119.99</a> appeared first on <a href="https://www.popsci.com">Popular Science</a>.</p>