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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 code price check (UTC time):
2/16GB, Champagne Gold, International Version MIUI 8 Snapdragon 435 4100mAh Battery
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Redmi 4X 2/16GB Gold [HK].
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)).