Use coupon and get KZ Castor Wired Earphones with Bass Enhancement for $17.99 (from Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
KZ Castor Wired Earphone Tuning Adjustable Dual Drivers IEM HiFi Sound Deep Bass 3.5mm Wired In-ear Earphone Headphone – Black with Mic Bass Enhancement
Latest coupon code price check (UTC time):
Banggood ($17.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Low/high price? Cool, average is $19.39, so current price is lower!
Link: Banggood product page
Price: $17.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAudio9
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for KZ Castor Wired Earphones with Bass Enhancement.
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)).