$8.49 – WiFi Temperature Humidity Sensor (Banggood, Aliexpress: WiFi Temperature Humidity Tester Smart Home Integration Alexa Google Assistant Mobile App Control -10 to 60℃ 0-99% Humidity (the best price with coupon)).
Use coupon and get WiFi Temperature Humidity Sensor for $8.49 (from Banggood). Get coupons, create price alert or check price history out! What is best price?
Latest price update (UTC time):
Banggood ($8.49)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it cheap? From what I can see this price is higher than average price ($7.99).
Link: Banggood product page
Price: $8.49
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG777610
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for WiFi Temperature Humidity Sensor? There we go. The lowest price was: $7.49.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).