Amazon has Govee WiFi Water Sensor 3 Pack, Smart Water Leak Detector, 100dB Adjustable Alarm Suit for Home and Basement, Water Leak Alert with Email & APP Push for $26.39 after 40% off coupon (https://amzn.to/3VbYld8)
(https://m.media-amazon.com/images/I/61rVv4HOeSL._AC_SL1500_.jpg)