Just check coupons out (with price alert and history). Do you want to know what the best price is?
Temperature measurement range: 0°C~60°c, Battery: CR2032 button battery (Not include battery), Product weight: 59g, Product model: MHO-C601, Temperature display resolution: 0.1℃, Humidity display resolution: 1%RH, Humidity measurement range: 0%RH-99%RH, Product size: 88mm*70mm*12mm, Material: ABS
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($10.99): BGd6179a
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): BGXIN374, BGDEAL374, BGHU0085, BgcLuBofErtA10, BGOCFO374, BGNOFR374, BGELEHOME20, BGNOTD374, BGBFHOME35, BGDEALBF374, BGDETD374, BGAFF10OFF, BGMARFR374, BGMASE374, BGCuponation10, BGMRDC52, 13f142, BGAPSE374, BGAPDEAL2, BGAPFO374, BGHONEY2110, BGAPF374, BGNIT374, BGMAYSE374, BGMMCDE, BGSP374, BGMAYTD374, BGMU374, BGFFO374, BGJUTD374, BGwhielabel, BGPDhome51, BGLYFO374, BGTYC374, BGDL374, BGTYSP374, BGSPHOME39, BGTYSY374, BGNDH06, BGUdb53, BGUbf48, BGCZOU374, 00c906, BGXN374, BG00c906, 2022ACTIESNL, BGHB218, BGMAYB240, 2203ActiesNL, BGHECARE1, BG4ee866, BG6d8139, BG1260aa, BG0278c9, BG5467eb, Cuponation9, BG75597c
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Miaomiaoce MHO-C601 E-ink Thermometer Hygrometer.
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)).