Frequency Response: 10-20KHz, Resistance: 17Ω±10%, Model Number: ZXN, Cable Length: Approx. 1.25m±5cm, Package Size: 11.8*7*4cm/4.64*2.75*1.57in, In-line Remote: Yes, Color: Black / Blue / Gold, Needle Diameter: 2pin 0.75mm, Plug: 3.5mm Gold-plated, Microphone: Yes, Sensitivity: 109dB±3dB, Drive Unit: 10mm special tuning drive unit, Package Weight: 76g/2.68oz, Brand Name: QKZ.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($15.29): BGAlerabatKL
2. ($15.29): BGd173b4
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGBuscape01, BGBRPL2, BGHOTSHOP15
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for QKZ ZXN 4BA+1DD Earphones. The lowest price was: $12.24.
Price records source(s): 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)).