Just check coupons out (with price alert and history). You probably want to know what is the best price?
Brand Qingping, Connection BLE 5.0, Weight 38g (Stand / wall sticker and battery arenot included), Battery CR2430 button cell, Humidity 0~99.9%RH, Model CGDK2, Name Qingping Temp & RH Monitor Lite, Temperature 9.9~ 50℃, Material PC, Color White, Screen size Diameter 49.9 mm
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Youpin Qingping Smart Temperature Humidity Barometer 4 Alarm Modes Bluetooth 5.0 with Data Cloud Storage APP Remote Control | $60.75 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($13.99): BGGRMA162
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGe43f20, BGSHE15, 13f142, BGTYOC535, BGIS535, BGAU535, BGHUOB535, BGSPO535, BGHUOY535, BGTYDB535, BGTYOL535, BGXPJA128, BGXPJA129, BG00c906, BGHealth10D, 2022ACTIESNL, BGHB218, BGMAYB239
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Qingping Bluetooth 5.0 Mijia Temperature Humidity Sensor.
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)).