Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (23.57 USD): BGGines
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): e2bcea, 502C6B, TONFON, BG1534, 6C8E66, BGOMG2, TS15prime, TISPrime01, Tools1, AFfbG10, Tools3, BGCITYADS2019, BGparity2, BG111BB, BGPowerTool15, BG2020NS, BG782, BG11BB, BGAFF10OFF, BG2MFC, bGhOnEy10, BGherra, BGdragonBoat, BGPTOOL, BGoh22, BGPToo15, BGETS3, BGPower15off, BG123FBR, BG123F2021, BGPTL088, BGb48356, BGPHOOL8, BGHPT15
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Tonfon 3.6V Electric Screwdriver.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).