You can create price alert here, copy coupons and view price history. What is best price?
Frequency response: 20Hz – 20KHz, Connecting interface: 2.5mm, Sensitivity: 94dB, Impedance: 36ohms
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Do you need price history chart (for all/most countries) for HBQ-I7 Bluetooth Earphones? There we go.
Price records source(s): Gearbest
Click on image to enlarge. 
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)).