Aliexpress
Click here… to search for Xiaomi Mi9 Transparent 8/128GB CN Black on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (573.29 USD): BGaDmITAd
Coupon (585.89 USD): od7off
Coupon (592.19 USD): affiliate6
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BG6M9T, aff7off, bgssaff9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Mi9 Transparent 8/128GB CN Black? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).