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
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Volume Control Yes, Microphone Yes, Frequency Response 20-20kHz, Brand Edifier, Waterproof IPX5, Interface Type-C, Color Black, Receive Sensitivity 96dB, Charging Time (h) 1.5h, Music Time about 4 hours (earbuds) + 18 Hours (case), Support Audio decoding APT / AAC, Transmission Distance 33 feet (10m), Supported Profiles HSP/HFP/A2DP/AVRCP, Model GM4 Mini 1, bluetooth Version V5.0, Wearing Type In-ear
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($52.89): 13f142
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGGM4M1, BGGM401, BG4BW25, BGLOAC1, BGa0b145
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Edifier GM4 Bluetooth 5.0 Earphones.
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)).