Frequency response: 20~20KHz, White, Driver unit: 10mm, Sensitivity: 91±3dB, Plug Type: 3.5mm, Full-sized.
Basically copy coupon, view price history or create e-mail price alert. Best price?
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): e2bcea, TTxBG10, 2019SPEDM, BG3CSUM, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, EARSP11, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGSS10%SW, BGELIG0920, BG11SHOP, BG4BW25, BGLOAC1, BGa0b145
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – UIISII C100 In-ear Earphones ($-3)
Price history and price alert
Price history (for all/most countries) for UIISII C100 Earphones White is here. The lowest price was: $2.65.
Price records source(s): Gearbest, 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)).