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Aliexpress
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Latest price update (UTC time):
Operating System: MIUI 9, CPU: Qualcomm Snapdragon 660, 8.0 inch Capacitive Screen with 2048x 1536 Resolution, 4GB RAM + 64GB eMMC ROM
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi Pad 4 4/64GB Black.
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)).