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Latest price update (UTC time):
Sleep Monitor Geomagnetic Sensor GPS with Corning Gorilla Glass Screen, Heart Rate
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Amazfit BIP Black [Fast-23].
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)).