When I was updating this page the price was $6.99 for Xiaomi Duka TH1 Electronic Temperature Humidity Meter (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Xiaomi Duka TH1 Electronic Temperature and Humidity Meter High Precision Vertical Infant Room Thermometer Digital Meter for Home
Latest coupon code price check (UTC time):
Banggood ($6.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. What about the price? From what I can see this price is higher than average price ($6.45).
Link: Banggood product page
Price: $6.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTOOS729, BG87f07f
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Xiaomi Duka TH1 Electronic Temperature Humidity Meter is here.
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)).