Just check coupons out (with price alert and history). Do you want to know what the best price is?
International Edition MIUI 8 5.7 inch 4G Phablet Snapdragon 821 Quad Core 2.35GHz 4GB RAM 64GB ROM Dual 13.0MP Rear Cameras Fingerprint Scanner NFC
Aliexpress
There’re some similar (or not) items on Aliexpress
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Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Mi5S Plus 4/64GB Gray.
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)).