This deal has ended.
Update: Check out the price cut. Amazon still has a Three-Pack of Zircon Leak Alert Electronic Water Detectors on sale for only
$26.65 $$25.99, the lowest online. Receiving 4 out of 5 stars from over 60 buyers, these require no wiring, have a loud detection alarm, and can float while continuing to alarm for up to 72 hours. Shipping is free and there's no sales tax (except KS, KY, ND, NY, WA).