Aliexpress
Click here… to search for Xiaomi Air 12.5 m3-7Y30 4/128GB Silver on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (690.83 USD): Wholesale20
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): 1912BGNEW3, TECH8%, 6OFFXM
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi Air 12.5 m3-7Y30 4/128GB Silver is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).