Just check coupons out (with price alert and history). Best price?
Camera: 5.0MP front camera + 12.0MP + 12.0MP dual back cameras, E-compass, RAM + ROM: 6GB RAM+64GB ROM, A-GPS, Glonass, Accelerometer, Barometer, Display: 5.99 inch, Bluetooth: 5.0, Beidou, SIM Card: dual SIM dual standby. 2x Nano SIM card, 2160x 1080 Pixel Screen, Fingerprint Sensor, Feature: GPS, Hall Sensor, System: MIUI 9, Ambient Light Sensor, Vibrating Motor, Sensor: Proximity Sensor, Gyroscope, CPU: Qualcomm Snapdragon 845 Octa Core 2.8GHz, Galileo
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There’re some similar (or not) items on Aliexpress
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Latest coupon code price check (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi Mix 2S 6/64GB White [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)).