You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Cable Length (m): 0.6m, Charging Time.: 2.5h, Frequency response: 110Hz-20000Hz, Impedance: 32ohms, Music Time: 7h
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Oldshark SIE00130B Wireless Earphones.
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)).