Aliexpress
Click here… to search for Xiaomi AMAZFIT Marathon Running Shoes 40-45 on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (49.19 USD): 715bfc
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): d8f2bb, TTxBG10
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi AMAZFIT Marathon Running Shoes 40-45.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).