Aliexpress
Click here… to search for Realme X2 Pro 6/64GB CN Blue on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (467.99 USD): BGCITYADS2019
Coupon (483.59 USD): od7off
(CouponsFromChina.com tip: apply code in your basket (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): BGRMX2P6
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Realme X2 Pro 6/64GB CN Blue.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).