Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (597.08 USD): BG8OFFCOUPON
(CouponsFromChina.com tip: this code has to be applied 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): BG5f2ddf, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, BG516252, BGa63b08, BGd32f49, BG0c4336, BGbef35c, BG9445f3, BGe3ec0a, BG2f062d
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi 11T Pro 8/128GB Snap888.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).