Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (99.44 USD): BGherra
(CouponsFromChina.com tip: apply it 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): 502C6B, e2bcea, BG1534, AFfbG10, TS15prime, TISPrime01, Tools1, Tools3, BGCITYADS2019, bgParity3, BGPowerTool15, BG2020NS, BG3074, BGAFF10OFF, BGTT10, bGhOnEy10, BGPTOOL, BGoh22, BGNEW15
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Xiaomi Tonfon 20V Impact Drill 45Nm 2000mAh is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).