You can create price alert here, copy coupons and view price history. Best price?
Plug Type: 2.5mm, Frequency response: 20Hz – 20KHz, Impedance: 36ohms, Sensitivity: 94dB
Aliexpress
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Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Here is price history (for all/most countries) for HBQ-I7 Wireless In-ear Earphones.
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)).