Aliexpress
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Here are coupons that you can use.
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Black (-3 USD)
2. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Red (-3 USD)
3. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Blue (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (388.87 USD): BG9TP6D
Coupon (393.07 USD): BG9TPCL4
Coupon (395.17 USD): BG9TPCL3
Coupon (398.85 USD): BG9TPCL2
Coupon (404.63 USD): BG9TPCL
Coupon (407.93 USD): BGplmi9tp128
Coupon (415.14 USD): BG9TP6
Coupon (478.94 USD): od7off
Coupon (505.99 USD): 7bcdf9
(CouponsFromChina.com tip: apply it 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): BG19TP, BG29TP8, BGM9TP128, BG9TP128, BG9TP1UU, BG9TP50, BG9TPRO, BGMI9TEU3, BG9TP128U7, BGMI9TPRO128B, BG109TP, BG119TP, BG9TRGG, BG9TP6128, BG9TP855, BGD119TP855, BGHU503, BGPL119TPRO128, BG59T128, BGBFX9T128, BGBFSP9TP, BG9TPEE, BGD129TP, BG129TPBR, BG29TP, BG29TPCL
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Black (-3 USD)
2. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Red (-3 USD)
3. Hong Kong – Xiaomi Mi9T Pro 6/128GB Global Blue (-3 USD)
Price history and price alert
Price history (for all/most countries) for Xiaomi Mi9T Pro 6/128GB Global White is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).