Check coupons or create price alert down below. Best price?
Resolution 2340*1080 Pixel, RAM 6GB, 3900mAh(min), ROM 128GB, GPU Adreno 640, Kryo 485, 7nm, OS MIUI 10, CPU Qualcomm Snapdragon 855 Octa Core (max to 2.84GHz), Display Size 6.39 Inch AMOLED, Battery(Built-in) 4000mAh(typ), (1×2.84GHz + 3×2.42GHz + 4×1.80GHz)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($368.99): BGBFAFF2019
2. ($368.99): BGCITYADS2019
3. ($381.29): od7off
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG7K20P2, aff7off
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Redmi K20 Pro 6/128GB Black.
Price records source(s): Gearbest, 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)).