Just check coupons out (with price alert and history). Do you want to know what the best price is?
Name Xiaomi Capsule Earphone, Wearing Type In-ear, Color Black, Length 1.25m, Model DDQ01WM, Plug Type 3.5mm, Net Weight (g) 13g, Volume Control No, Impedance 32Ω, Microphone Yes, Brand Xiaomi
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($12.59): BG9d995e
2. ($15.63): BGAUDIO
3. ($15.63): BG9ba0e8
paste coupon code in your cart and click Apply 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): BG5fa8b5
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Capsule DDQ01WM Earphones 3.5mm.
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)).