Gearbest has the Xiaomi Aqara Smart Water Sensor for $13.86. Use coupon code GB11.11ConE for 17% off to drop the price to $11.50. Free shipping takes about a month to arrive.
This is a Zigbee sensor I believe. Works with Samsung Smartthings using a custom device handler. It can be tricky to pair to the hub but once set up, it works great. Cheaper than Samsung’s own water sensors.
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