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Aliexpress
There’re some similar (or not) items on Aliexpress
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Latest coupon and price update (UTC):
Material: ABS, 9V 6F22 battery
Price history and price alert
Here is price history (for all/most countries) for SS-168 Smoke Detection Alarm.
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)).