Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (107.09 USD): BGAlerabatKL
Coupon (107.09 USD): BGAUDIO
(CouponsFromChina.com tip: just apply this code 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): BG263474, BG5ffb09, BGBuscape01, BG651551, BGBRPL2, BG21e5dd, BGHOTSHOP15, BG53e9c8, BGd173b4, BGAudioVideo
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Bluedio V2 Bluetooth 5.0 Headphones ANC PPS12 is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).