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TGB Supply via Amazon [amazon.com] has Kidde WiFi Water Leak Detector & Freeze Alarm for $17.15 Shipping is free w/ Prime or on $35+.

Walmart [walmart.com] also has Kidde WiFi Water Leak Detector & Freeze Alarm for $17.15. Shipping is free w/ Walmart+ (30-day trial for $1 [walmart.com]) or on orders of $35+.