Aliexpress
Click here… to search for Xiaomi Cotton Smith Heating Down Vest on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (66.74 USD): BGSPW011
Coupon (78.42 USD): BG589b2e
(CouponsFromChina.com tip: just apply this code 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): BGXMCSVIP, 502C6B, BGXMPMA01, AFfbG10, BGjacketvest, BG11ev02, BGXMQTCT, BGBFAFF2019, BGESXMCCC, BGFDCC, BGISSAMXCC, NYME35, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGJUKUW, BGWAKJYA, BGUKUYWQ, BGCS5227, BGVESTA, BGDWEAD5, BGwhielabel, 7bcdf9, BG10OFFAFF1, BG749175, BG98a77f, 2022ACTIESNL, BGShoes111, BGOT666, BGaa4e68, BgGoodie9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, ADMITADBLACK, BG8OFFCOUPON, TTBLACK5, BG31e333, Sports23q1, BGSaleFeb8, BGSaleAD
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Cotton Smith Heating Down Vest.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).