The Smartest House via eBay offers the open-box Fibaro Z-Wave Certified Flood Sensor for $26.99 plus $2.70 for shipping. That's $10 under our July mention of a factory-sealed model and $6 below the best price for one today. Features include three 24K plated gold telescoping feet, leak detector, temperature and tilt sensor, and connectivity to the SmartHub app for iOS or Android.