Here is another smart sensor that monitors water usage and lawn sprinklers and lets you know when you are dealing with a leak. The Flume lets you know where you are spending most of your money on water. It sends you smart alerts to your iOS/Android device when leak is detected.
Flume is WiFi enabled, so you can check on its status anytime. It works with the majority of water meters. Sets you back under $200 at this time.