Just check coupons out (with price alert and history). You probably want to know 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 coupon and price update (UTC):
Xiaomi Redmi 4X 4G Smartphone 5.0 inch MIUI 8 Snapdragon 435 Octa Core 1.4GHz 13.0MP Rear Camera Fingerprint Scanner 4100mAh Battery
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Redmi 4X 3/32GB Black [Fast-08].
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)).