Walmart offers the La Crosse Technology Temperature and Humidity Comfort Meter for $9.98. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $4. It features temperature and humidity readouts and a low battery indicator.
Walmart offers the AcuRite Wireless Weather and Intelli-Time Clock Station for $6.88. Choose in-store pickup to avoid the $5.99 shipping charge. That's tied with last week's mention as the lowest price we've seen. (It's the best deal now by $6.) It's pre-programmed with the time, day, and date (through 2050) and monitors indoor and outdoor temperatures. Five AA batteries are required, not included.