How much does this cost to the nearest dollar?

Zwetke Water Leak Detector 12vdc for Boats & RV - Loud Water Alarm with Detachable 5ft Cord Sensor - no Internet or Battery Needed – Up-gradable with Optional sensors
Prevent monetary loss & health risks caused by leaking water in your boat, RV or property. Our automatic water sensor alarm keeps a watch where it matters. A simple, reliable & effective early warning system of any leaks. Very loud (85dB) alert sounds when water detector alarm is triggered. Very Sensitive Advanced Electronic Design to detect even the slightest amount of moisture. Built to last No moving parts to fail, like float switches. No network connection needed. Sensors are small & light, making them easy to fit attached to a wall or even installed directly on pipes for pipe dripping detection.

Price is $29.00
Price: $29