Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (30.59 USD): BGAUDIO
Coupon (30.59 USD): BG9ba0e8
(CouponsFromChina.com tip: apply it in your 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): 502C6B, TTxBG10, BG3CSUM, AFfbG10, BGBFAFF2019, BGCITYADS2019, 7bcdf9, EARSP11, BGMPB2020, BGAFF10OFF, bGhOnEy10, Email5, BGSS10%SW, bgshOOp10, BGELIG0920, BG11SHOP, BG11PP12, 7d18f7, BG4BW25, BGLOAC1, 13f142, BG004BA, BG004BA27, BG6671, BG331ccc, BGHU0539, BGa0b145, BG73478b, 6GSGIT, BGBRPL2, BGHOTSHOP15, BG1bca04, BG53e9c8, BG78c597, BGAlerabatKL, BGdeb43f, BGd173b4, BGAudioVideo
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 1MORE E1004BA Earphones is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).