Amazon offers Prime members the La Crosse Wireless Indoor Comfort Temperature Station, model no. WT-137U, for $8.47 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.58.) That's a buck below our January mention and the lowest total price we've seen. (It's also a current price low by $3.) This station displays the indoor temperature and humidity. It requires one AAA battery (not included).