Aliexpress
Click here… to search for Youpin SOLOVE Humidifier 400ml on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (33.64 USD): 6GSGIT
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Youpin SOLOVE Humidifier 400ml.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).