WowItIsCool offers the Blackloud Smart Wi-Fi Water Sensor and Leak Detector for $24.96 with free shipping. That's $15 off list and the lowest price we could find. Deal ends June 12. Buy Now Features app push-notification alerts instant alerts to water leaks 802.11n wireless powered with 2 AAA batteries (not included)
WD-40 is handy in a lot more situations than you likely realize.