Aliexpress
Click here… to search for Xiaomi RedmiBook Air 13.3 i7-10510Y 16/512GB on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (1098.99 USD): 13f142
(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): BGXMAIR1, Email5, BGHALLOWEEN, BGXMAIRK1, BGXMAIRK2, BGXMAIRK3, BGXMAIRK4, BGXMAIRK5, BGXMAIRK6, BGXMAIRK7, 7d18f7, BGXMAIRK8, BGXMAIRK9, BGXMAK11, BGXMAK12, BGXMAK13, BGXM21NY4, BGXMAK14, BGXMAK15, BGXMAK16, BGXMAK17, 451feb, BGXMSP12, BGXMY71, BGXMY72, BGXMY76, BGXMY77, BGDEXM658, BGXMY78, BGXMY79, BGXMY80, BGXMY82, BGXMY83, BGXMY84, BGXM50OFF2
(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 i7-10510Y 16/512GB.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).