Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (36.31 USD): BGShoes111
Coupon (36.31 USD): BGOT666
(CouponsFromChina.com tip: you should apply the coupon 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): BG90SS, BGCS5227, BGCCSPA, BGSSJKU, BGwhielabel, 13f142, BG10OFFAFF1, BG6095c9, BG4d9120, BG1074d6, 00c906, BG98a77f, 2022ACTIESNL
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Xiaomi 90Fun Outdoor Sport Shorts is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).