Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
Voltage: 21V, Diameter: 0.8-10mm, No Load Speed: 0-1900 RPM, Rotating Speed: 0-450/0-1550r/min, Max. Torque: 30-45Nm, Battery Fuel Gauge: YES
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($47.12): BGherra
2. ($47.12): BG123F2021
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): b494f7, 20tools, 502C6B, 33b9d8, Brand2, bgssaff9, AFfbG10, TS15prime, BGTEP2, TISPrime01, Tools1, Tools3, BGCITYADS2019, BG11BB, BG111BB, BG2SPS, BGPowerTool15, BG2020NS, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGPTOOL, BGoh22, BGPToo15, BGETS3, BGPower15off, BG931bb3, BG123FBR
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Raitool 21V Electric Power Screwdriver.
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)).