Aliexpress
Click here… to search for Xiaomi Air 12.5 M3-7Y30 4/256GB Notebook Gold on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Air 12.5 M3-7Y30 4/256GB Notebook Gold.
Price records source(s): Gearbest
Click on image to enlarge. 
You can set price alert (for Banggood).