Aliexpress
Click here… to search for HUAWEI Honor 9X 6/128GB Black on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (264.99 USD): 7d18f7
(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): BGH9X6, aff7off, od7off, BGBFAFF2019, BGMPB2020, Email5, bgshOOp10
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for HUAWEI Honor 9X 6/128GB Black.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).