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 coupon and price update (UTC):
5.15 inch 2.5D Arc Screen MIUI 8 Pinecone V670 Octa Core 2.2GHz 3GB RAM 64GB ROM 8.0MP + 12.0MP Cameras Fingerprint Scanner
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi5C 3/64GB Golden [Fast-29].
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)).