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):
5.45 inch, Android 8.1, Helio P22 Octa Core 2.0GHz, 3GB RAM, 32GB ROM, 12.0MP + 5.0MP Rear Camera, Fingerprint Sensor, 3000mAh Built-in Li-ion
Price history and price alert
Price history (for all/most countries) for Xiaomi Redmi 6 3/32GB Dark Gray [HK] is here.
Price records source(s): Gearbest
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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)).