Aliexpress
Click here… to search for Oneplus Bullets Wireless 2 Earphones on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (132.99 USD): 13f142
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): 8fbade, 502C6B, AFfbG10, BG20CES, EARSP11, bGhOnEy10, Email5, BGSS10%SW, bgshOOp10, BG11SHOP, 7d18f7, BG4BW25, BGLOAC1
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Oneplus Bullets Wireless 2 Earphones.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).