Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 13f142, BGXMI5NF2, 451feb, BGXMI5NF3, BGXMI5NF4, BGXMSP02, BGXMI14MX, BGXMI5NF5, BGXMI5NF6, BGXMI5NF7, BGXMI5NF8, BGXMI5NF9, BGXMI5N11, BGXMI5N12, BGXMI5N13, BGXMI5N20, BGXMI5N21, BGXM14SP1, BGBDXM14, BGITXMPP07
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi RedmiBook Pro 14 2021 Laptop i5-1135G7 MX450 16/512GB.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).