1.2m, 3.5mm audio jack, 102 ± 3dB, 5mW, 32Ω, 20Hz-20kHz.
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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. ($12.97): BGAFF10OFF
2. ($12.97): bGhOnEy10
put item in your cart and apply coupon code there 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): 12blitzw, e2bcea, 15BW, BGss10%bw, AFfbG10, 502C6B, BGVDay10%off
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf BW-ES1 Graphene Earphones. The lowest price was: $10.99.
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)).