You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Connecting interface: 3.5mm, Frequency response: 10-40KHz, Impedance: 22ohms, Sensitivity: 107dB
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($29.69): BG4BW25
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 1a3b8f, e2bcea, TTxBG10, aff7off, BG3CSUM, bgssaff9, AFfbG10, 0e7f33, EARSP11, FBCOUPON1, BGAFF10OFF, BGTT10, bGhOnEy10, BGSS10%SW, bgshOOp10, BGELIG0920
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – KZ ZSR Earphones Black Standard ($-3)
Price history and price alert
Price history (for all/most countries) for KZ ZSR Hybrid Earphones With Mic is here.
Price records source(s): Gearbest, Banggood
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)).