Aliexpress
Click here… to search for Raitool 21V Electric Power Screwdriver on Aliexpress
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
Coupon (47.12 USD): BGherra
Coupon (47.12 USD): BG123F2021
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): 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).