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 (74.16 USD): BG10OFFAFF
Coupon (81.40 USD): 13f142
(CouponsFromChina.com tip: apply it 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): BGWarmer, AFfbG10, Email5, BG2020NS, BGVDay10%off, BG6390, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHWDEALS, BgoFErTaSchInA10, BgcLuBofErtA10, BGHOMEA13, BGCuponation10
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Happy Life 1500W Electric Warm Air Blower Foot Warmer.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).