Just check coupons out (with price alert and history). What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Wireless Charging time: 2.5h, Frequency response range: 20HZ – 20KHZ ; Wireless Range: 10M, Driver sensitity: 104dB KHz, ANC ON: 4h(charging one time) / 20h (charging box), Driver: 6mm Balanced Membrane(MagnetoSatic) + 11mm Dynamic, Wired Charging time: 80min(earphone); 110min(charging case), Music play time(50%volume): , ANC OFF: 5.5h(charging one time) / 25h (charging box), Battery: 44mAh(headphones) / 535mAh (charging case) ;, Water resistance|(headphones): IP54, Name: OPPO ENCO X ANC Wireless Earphone (Active Noise Cancellation)
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($177.68): BG651551
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): BGLOAC1, 13f142, BGOPPOX, BGf398d0, BGa0b145, BG0b9530, BGBuscape01
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for OPPO Enco X Bluetooth 5.2 Earphones. The lowest price was: $118.99.
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)).