Color: Black, Function: Keep warm and Prevent cold, Power Supply Interface: USB, Size: S/M/L/XL/2XL/3XL, Age Of Application: Adults Men, Power Supply: 5V/2A Mobile Power(Not Included), Material: Polar Fleece Fabric.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG874a27, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG589b2e, Sports23q1
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Electric Heated Waistcoat Vest. The lowest price was: $24.62.
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)).