I have checked all old coupons and price is 29.99 USD for TENGOO HP-08 Heated (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest coupon and price update (UTC):
Banggood (29.99 USD)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). But wait a sec… Is it a good price? Let’s see… Average price for this item is 37.99 USD and current one is 29.99 USD, so it’s a good price!
Link: Banggood product page
Price: 29.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGTYHP08, BGEUHP08
(these coupons are old, so probably won’t work)
Aliexpress
Click here… to search for TENGOO HP-08 Heated Pants on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for TENGOO HP-08 Heated Pants is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).