Music time 5hr/6hr(ANC ON/OFF), Charging port Type-C, Pairing name QCY-HT03, Battery capacity(case) 380mAh, Operation range 10m, Talk time approx. 3.5hr, Model HT03, BT Version BT5.1, Available system iOS/Android, Brand QCY, Certified model BH21HT03A, Wireless Profiles HFP/HSP/A2DP/AVRCP, Top-ups by case 3(for both earbuds).
Price history, coupons and price alert are available on this page. 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 and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($42.49): BGAlerabatKL
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): BGYHT03, BGBuscape01, BG651551, BGBRPL2, BGHOTSHOP15, BG53e9c8, BG57e96b, BGAlerabat1, BGHU1816
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for QCY HT03 ANC Bluetooth Earphones. The lowest price was: $34.99.
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)).