Card Extend: Yes, , OS: EMUI 10.1 (Based on Android 10), GPU: Mali-G76, RAM: 8GB, NPU: Dual Big Core + Tiny Core NPUs (Neural-network Processing Unit), ROM: 128GB, CPU: HUAWEI Kirin 990 5G Octa-Core (2x Cortex-A76 Based 2.86 GHz + 2x Cortex-A76 Based 2.36 GHz + 4x Cortex-A55 1.95 GHz), support external NM card up to 256GB.
Check coupons or create price alert down below. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($594.99): 7d18f7
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGHP40, Email5, BG8HP40, bgshOOp10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for HUAWEI P40 8/128GB Global is here. The lowest price was: $519.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).