Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Resolution 2340*1080 Pixel, AIE 4th Generation AI Engine, ROM 128GB UFS2.1, MI Turbo Yes, Display Size 6.39 Inch AMOLED, RAM 8GB LPDDR4x 2133MHz, CPU Qualcomm Snapdragon 855 Octa Core (1x 2.84GHz + 3x 2.42GHz + 4x 1.80GHz), GPU Adreno 640, OS MIUI 10, Game Turbo Yes
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 3BGM98, 6OFFXM, BGaDmITAd, 7bcdf9, od7off, BGBFAFF2019, BGCITYADS2019
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Mi9 8/128GB Blue ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Mi9 8/128GB Grey? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).