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Aliexpress
There’re some similar (or not) items on Aliexpress
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Latest price update (UTC time):
Powered by 2x AA battery (not included)., 20 wireless channels, support up to 20 groups simultaneously handle work in a room
Price history and price alert
Check out price history chart (for all/most countries) for HUAY EF-008 2.4GHz Wireless Game Controller.
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)).