Xiaomi Black Shark 2 6/128GB CN Black (Banggood, Aliexpress: max to 2.84GHz, Card Extend Not support, CPU Qualcomm Snapdragon 855 Octa Core, Display Size 6.39 Inch AMOLED 19.5: 9, 3900mAh(min), ROM 128GB UFS 2.1, 4000mAh(typ), GPU Adreno 640, OS Joy UI (Android 9.0), Resolution 2340*1080 Pixel, RAM 6GB LPDDR4x (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($558.58): Email5
coupon code has to be applied in shop’s 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/feV
Old coupons (from the oldest to the newest): 4BGBS2, bgssaff9, aff7off, od7off, BGaDmITAd, 7bcdf9, BGBFAFF2019, BGCITYADS2019
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Black Shark 2 6/128GB CN Black. The lowest price was: $489.99.
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)).