Aliexpress
Click here… to search for Xiaomi Deerma DEM-F625 6L Air Humidifier on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (51.66 USD): BGHome15%
Coupon (54.70 USD): BGTT10
Coupon (54.70 USD): bGhOnEy10
Coupon (54.70 USD): BGSS10%SW
Coupon (55.78 USD): 7d18f7
(CouponsFromChina.com tip: apply code in your basket (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): 502C6B, d8f2bb, f8aaf1, 919c60, BGDEER05, BGss506, bgssaff9, aff7off, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, 2020CNY, BGVDay10%off, BGHOMEAPP, bgshOOp10
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Deerma DEM-F625 6L Air Humidifier? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).