3900mAh(min), GPU Adreno 618 max to 610MHz, Display Size 6.39 Inch AMOLED, Battery(Built-in) 4000mAh(typ), Resolution 2340*1080 Pixel, OS MIUI 10, RAM 6GB, 8nm, ROM 128GB, CPU Qualcomm Snapdragon 730 Octa Core (max to 2.2GHz) Kryo 470.
Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
1. ($267.21): BGXMT902
2. ($277.49): BG029TCL
3. ($287.77): BG129TCL
4. ($287.77): BG029T
5. ($287.77): BGIssamXRM9T2
6. ($287.77): BG19T8
7. ($287.77): BGN9TEE
8. ($287.77): BGN9T128
9. ($287.77): BG29T
10. ($321.89): BGXX9T128
11. ($362.99): Email5
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): affiliate6, BGMI9T6128, aff7off, bgssaff9, BGEM9T128, BG9T128PL, BGXTODAYMI9T4, BG79T128, BGM9TIS, BG79TEE, BG89T128, BG89T6C, od7off, BG9TWK, BGMI9T10, BG9T13, BGaDmITAd, BGPUREMI9T128G, 7bcdf9, BG119T8, BGHU505, BG59T8, BGBFAFF2019, BG9T821, BGBF9T8, BGCITYADS2019, BGBF9T128, BGX9T128, BGAFF04, BG019TCL, BG129TBR, BGNAMI9T128, BG39T, BG39T8, BG59T8CL, BG59T28, 7d18f7
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. Hong Kong – Xiaomi Mi9T 6/128GB Global Black ($-3)
2. Hong Kong – Xiaomi Mi9T 6/128GB Global Blue ($-3)
3. Europe – Xiaomi Mi9T 6/128GB Global [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi9T 6/128GB Global Red. The lowest price was: $249.99.
Price records source(s): Gearbest, 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)).