Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Temperature range: -50 – 70 Deg.C, Measuring humidity range: 10pct RH – 99pct RHPower supply: 2x 1.5V LR44 button battery (built-in)
Aliexpress
There’re some similar (or not) items on Aliexpress
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. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($8.82): BGherra
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): 15ANENG, TTxBG10, aff7off, bgssaff9, AFfbG10, BG3338, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGAFF10OFF, bGhOnEy10
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Mini Digital LCD Indoor Thermometer Hygrometer is here.
Price records source(s): Gearbest, 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)).