Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Youpin Smart4u Bicycle Helmet Black (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (56.71 USD): 935bc1
(CouponsFromChina.com tip: apply code in your basket (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): a9e2f1, AlibuySH50, 0a4f61, Alibuy91224, LSTR93
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Youpin Smart4u Bicycle Helmet Black (-3 USD)
Price history and price alert
Do you need price history chart (for all/most countries) for XIAOMI Smart4u SH50 Cycling Helmet White? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).