Walmart offers the the La Crosse Wireless Indoor Comfort Temperature Station, model no. WT-137U, for $8.33. Choose in-store pickup via Site-to-Store to dodge the $4.97 shipping charge. (Amazon charges the same with free shipping for its Prime members.) That's tied with our mention from a month ago and $3 under the lowest shipped price we could find elsewhere. This station displays the indoor temperature and humidity. It requires one AAA battery (not included).