Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Digoo DG-BC20 IP45 Thermometer Hygrometer White (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (5.72 USD): BGDigoo15%
Coupon (6.06 USD): bGhOnEy10
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BC2018, BC333, 484ac6, 502C6B, 0404digoo, e2bcea, vipupgrade8, TTxBG10, AFfbG10, BGBC203, BGBC2033, BGBC2039, BGBFAFF2019, BGBS2038, BGCITYADS2019, BGBFI388, BGBGHFRI15, BGROG215, BG20bc3, BGVDay10%off, BGDG15
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Digoo DG-BC20 IP45 Thermometer Hygrometer White (-3 USD)
Price history and price alert
Do you need price history chart (for all/most countries) for Digoo DG-BC20 Bathroom Thermometer Hygrometer Black? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).