Aliexpress
Click here… to search for Xiaomi Tonfon 12V Electric Screwdriver on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. 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): e6c16d, 759ccb, 20tools, 502C6B, TOOL323, e2bcea, BG1534, BGHT16, BGTONS, BGCS20, bgParity1, BGherra, BGPTOOL, BGoh22, BGPToo15, BG6fde54, BG123F2021, BGPTL088
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Tonfon 12V Electric Screwdriver.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).