Aliexpress
Click here… to search for Xiaomi Anti-UV Polarized Sunglasses Grey on Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Stone blue Xiaomi Anti-UV Polarized Sunglasses (-3 USD)
2. China – Xiaomi Anti-UV Polarized Sunglasses Golden (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (47.73 USD): BGAFF10OFF
(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): 34398b, aff7off, AFfbG10, BGMPB2020, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10
(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 2 another warehouse/versions!
1. China – Stone blue Xiaomi Anti-UV Polarized Sunglasses (-3 USD)
2. China – Xiaomi Anti-UV Polarized Sunglasses Golden (-3 USD)
Price history and price alert
Price history (for all/most countries) for Xiaomi Anti-UV Polarized Sunglasses Grey is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).