You can get zigbee ones from Omega [1] for around $200. Still kinda pricey but they are battery powered and optionally come with nema enclosures so you can stic

You can get zigbee ones from Omega [1] for around $200. Still kinda pricey but they are battery powered and optionally come with nema enclosures so you can stick them nearly anywhere. But having said that they were are not the most reliable product I've ever used. Getting it under $50 would be nice even if also not reliable. [1] http://www.omega.com/guides/humidity.html http://www.omega.com/guides/humidity.html