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 (569.99 USD): BGXMAX6
Coupon (569.99 USD): BGLAPXM1108
Coupon (589.99 USD): BGXMAX5
Coupon (752.64 USD): Wholesale20
(CouponsFromChina.com tip: just apply this code in your 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): 10MX2B108X2B1B0GMX81, LPBF1824, 1G2BMX881, 1225CAR, 12BGMX881, 19BGMX881, 6OFFXM, 37BGMX881, TECH8%, 25BGMX881, 401BGMX881, BGMX88155, BG55881, BGXM8124, aff7off, BGXM3D10, BGXM0719, BGXM0724, BGXM0936, affiliate6, BGXMA508, 10MX2BG, 108X2BG, BGXMAX1, BGXMAX2, BGXMAX3, BGXMAX4
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Notebook i5-8250U 8/128GB/1TB MX110.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).