Aliexpress
Click here… to search for HUAWEI HONOR 20 8/128GB on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (372.99 USD): Email5
Coupon (372.99 USD): bgshOOp10
(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): BGHH20, aff7off, 7bcdf9, od7off
(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 20 8/128GB.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).