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.
Go down and check coupons out. Remember to check price history if it is available. What is the best price?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($13.99): BGGRMA162
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
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
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Qingping Bluetooth 5.0 Mijia Temperature Humidity Sensor is here. The lowest price was: $9.99.
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)).