Aliexpress
Click here… to search for Youpin SOLOVE Humidifier 400ml on Aliexpress
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
Coupon (33.64 USD): 6GSGIT
(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): BGHONEY2110, BGSHOM15, BGSHE15, 13f142, BG10OFFAFF1
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Youpin SOLOVE Humidifier 400ml? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).