Thumb Score: +1

All Insteon sensors are $ 20 with coupon code SENSOR20

https://www.smarthome.com/promoti…nsors.html

Price comparisons
Water leak – $ 18.50 – 28 on Amazon
Open/close – $ 22-25 on Amazon
Hidden door – $ 28-35 on Amazon
Motion – $ 28-35 on Amazon

Shipping is about $ 6-7 so it may not be much better than amazon with prime shipping.