Aliexpress
Click here… to search for Xiaomi Bluetooth 4.0 Mouse Gray on Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Hong Kong – Xiaomi Bluetooth 4.0 Mouse Silver (-3 USD)
2. Europe – Xiaomi Bluetooth 4.0 Mouse [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: -3 USD
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
Old coupons (from the oldest to the newest): ca350e, 502C6B, TTxBG10, e18b44, BGRatones, BG3CSUM, bgssaff9, AFfbG10, BGjdsk52, BG11mouse05, 0e7f33, BGSS10%SW, BGAUXMM, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BGafec62, BGraton
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Hong Kong – Xiaomi Bluetooth 4.0 Mouse Silver (-3 USD)
2. Europe – Xiaomi Bluetooth 4.0 Mouse [EU] (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Bluetooth 4.0 Mouse Gray.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).