Thumb Score: +18 Yosmart via Amazon has for Prime Members: YoLink Water Leak Detector Smart Starter Kit w/ Hub + 4 Sensors on sale for $49.99 - 20% off when you 'clip' the coupon on the product page = $39.99. Shipping is free.[LIST][*]Note: You must be logged in to clip coupons; coupons are typically for one-time use.