Aliexpress
Click here… to search for Xiaomi Gaming Laptop i7-9750H GTX1660Ti 16/512GB on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (1239.99 USD): BGXMGK9
Coupon (1379.99 USD): Wholesale20
(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): BGXMGM7, BGXMGM8, BGXMGM9, BGXMGB1, BGBFCR28, BGXMGB5, BGCITYADS2019, BGXMBF01, BGXMGB6, BGXMGB7, BGXMGB8, BGXMGB9, BGXMGK1, BGXMGK2, BGXMGK3, BGXMGK4, BGXMGK5, BGXMGK8
(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 Gaming Laptop i7-9750H GTX1660Ti 16/512GB is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).