Monitorbook is a simple way to track things on the web and get alerts when something changes on the site. The service can be useful to track pricing, track specific headlines with keywords, track reviews, track competitors, and more.
MonitorBook is a useful tool to track things you care about. The possibilities of what you can track is up to you. The service offers a free version and a premium version that includes API, Authentication support, and Push Notifications.
Check out Monitorbook HERE