Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (845.99 USD): 13f142
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BGXMAIR6, Email5, BGXMAIR7, BGHALLOWEEN, BGXMAI11, BGXMAI12, BGXMAI13, BGXMAI14, BGXMAI15, 7d18f7, BGXMAI16, BGXMAI17, BGXMAI18, BGXMAI19, BGXMAI20, BGXMAI21, BGXM21NY2, BGXMAI22, BGXMAI24, BGESXMP07, BGXMAI25, 451feb, BGXMAI26, BGXMSP14, BGBZXMA1, BGXMAI27, BGXMAI28, BGXMAI29, BGXMAI31, BGXMS656, BGXMAI32, BGXMAI33, BGXMY95, BGXMY97, BGXM50OFF3
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Xiaomi RedmiBook Air 13.3 i5-10210Y 8/512GB Notebook.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).