Aliexpress
Click here… to search for HUAWEI P40 8/128GB Global on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. You can get coupon down below.
Link: Banggood product page
Coupon (594.99 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): BGHP40, Email5, BG8HP40, bgshOOp10
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for HUAWEI P40 8/128GB Global is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).