Aliexpress
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
Coupon (21.38 USD): aff7off
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 30DGPO, 1699TH, vipupgrade8, 15digoo, 1225CAR, 1599TH, 1499TH, 800307gr, ef72be, 1399TH, 0404digoo, 44DGSH, 12TH, BGDG8805, BGDigoo15%, BGE8805, BG11th8805, BG9TH8805, BGth8805
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Digoo DG-TH8805 Wireless Weather Station.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).