I have just checked coupons. The lowest price I could get is 12.99 USD for HS-02 2 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (12.99 USD)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. The question is – is it a good price? I have never seen better price than the current one in CouponsFromChina database, so it’s the best!
Link: Banggood product page
Price: 12.99 USD
12.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Click here… to search for TENGOO HS-02 2 Areas Heating Vest on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for TENGOO HS-02 2 Areas Heating Vest.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).