Xiaomi Youpin Baseball Cap Light Gray (Banggood, Aliexpress: Soft and breathable cotton, Material: Cotton (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($17.99): AFfbG10
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 502C6B, e2bcea, BGOD1, 2019SPEDM
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Xiaomi Baseball Cap Black ($-3)
2. China – Xiaomi Youpin Baseball Cap Lapis Blue ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Youpin Baseball Cap Light Gray. The lowest price was: $10.84.
Price records source(s): Gearbest, 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)).