You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Color Black, Heating Pads 9 /00€, Fever Area Back + Abdomen + Waist+Neck, Power Supply Interface USB, Size S/M/L/XL/2XL/3XL/4XL, Product name Heating Vest, Power Supply 5V/2A Mobile Power (Not Included), Material Nylon+Polyester
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($53.86): BGSCM11
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG04545f, BGMOTO478, BG725ae0, ADMITAD2212, BGce4f8a, 2022ACTIESNL, Terence, BGf6af5d, BGb9a33d, BGe6d4fc, 2203ActiesNL, BGf1706e, BG401f50, MVC8SPRING, BG0f1f1b, BG518acf, BG20iMars, BGdcbfa8, BG6d0adc, BGiMars2022, BG1b4e97, BG63985a, BG6b6693, BGCAR639
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for 9 Heating Pads USB Electric Heated Vest Jacket.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).