Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (294.00 USD): BGBF10TL
Coupon (294.00 USD): Email5
Coupon (384.99 USD): 7d18f7
(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): BGCD10TL
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Mi 10T Lite 5G 6/128GB Global is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).