Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Material 65% Nylon, Gender Men, Model 90 FUN, Weight 140g, Color Black/Blue/Grey, 35% Polyester
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($24.48): BGCS5227
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 6c8089, Mumlatzim53, TTxBG10, AFfbG10, 502C6B, 0e7f33, FBCOUPON1
(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 Xiaomi 90 FUN Quick-Dry T-Shirt is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).