Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe .
Link: Banggood product page
Coupon (6.99 USD): BGSHOEFF
Coupon (6.99 USD): BGSHOEEE
Coupon (10.79 USD): BGTT10
(CouponsFromChina.com tip: apply it 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): BGHU0144, BGHH90S
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for 5V 2A Electric Heated Feet Shoe Insoles [EU] is here.
Price records source(s): Banggood
Click on image to enlarge.
You can set price alert (for Banggood).