Aliexpress
Click here… to search for 9 Heating Area Electric Heated 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 (26.12 USD): BGSCM11
Coupon (27.90 USD): BG589b2e
(CouponsFromChina.com tip: this code has to be applied 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): BG0b71e5, BGSCM75, BGCAR639
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for 9 Heating Area Electric Heated Vest is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).