You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
3.7V, Frequency Response 20-20kHz, Transmission Distance 10M, Charging Time (h) 1-2h, Battery Capacity Charging Box: 580mAh, Impedance 32Ω, Standby Time (h) 80h, Talking Time 3-4h, bluetooth Version V5.0, Microphone Yes
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):
Banggood
Banggood warehouse is located in China. Coupons for Xiaomi QCY T1 Mini TWS Earphones? Nope, there’re no coupons 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/5cd
Old coupons (from the oldest to the newest): BG20QCY, TTxBG10, aff7off, BGT1, AFfbG10, BGSDC, BGCITYADS2019, BGVDay10%off, EARSP11, BGT1ML, bGhOnEy10, BGSS10%SW, bgshOOp10, BGELIG0920, BGHALLOWEEN, BG11SHOP, BG4BW25, BGLOAC1, 13f142, BGBuscape01, BG651551, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL, BGd173b4, BGAudioVideo, BGAUDIO, BG9ba0e8, BG1b5830
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi QCY T1 Mini TWS Earphones? There we go.
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)).