Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (221.32 USD): BGHOMEA13
Coupon (228.95 USD): bGhOnEy10
Coupon (245.39 USD): 7bcdf9
Coupon (245.39 USD): BGSS10%SW
(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): BGC16, wholesale20, Wholesale20, BGaDmITAd, BGSCD, BGBFAFF2019, BGCITYADS2019, BG9NY, BGHOMEAPP, BGMPB2020, bgshOOp10, BGHome15%, BGHOMEAPP13
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi HD-YWHL01 Smart Laundry Disinfection Dryer is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).