Just check coupons out (with price alert and history). What is the best price?
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):
5.99 inch, MIUI 9, Qualcomm Snapdragon 845 Octa Core 2.8GHz, 6GB RAM, 128GB ROM, Dual Rear Cameras, Bluetooth 5.0, Fingerprint Recognition, Wireless Charging
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi MI MIX 2S 6/128GB Global Black [Fast-08].
Price records source(s): Gearbest
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)).