Amazon offers the AcuRite 00613 Indoor Temperature & Humidity Monitor on sale for a low $7.97 plus free shipping on orders above $35, or with Amazon Prime. This sells for $11.65 at Home Depot. Limited time offer. That's the lowest price we could find. This has a 4.2 out of 5 star rating with over 12,000 reviews on Amazon.

• Measures indoor temperature (Fahrenheit or Celsius) and humidity
• Humidity level icon indicates high, low, or ideal indoor conditions
• Daily high and low temperature and humidity records
• Totally wireless tabletop and magnet-mountable design
• Powered by one (1) AA battery (not included)