Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf BW-BTS3 Sport Earphones [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (16.99 USD): BGBWBTS3
Coupon (20.69 USD): 12blitzw
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 20bts23, 25bts3, de14f3, 15bwear, 15bts23, 16BWBT, 30bts, 502C6B, 0e7f33
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf BW-BTS3 Sport Earphones [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for BlitzWolf BW-BTS3 Sport Earphones is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).