Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Battery: 21V 5*1500mAh, Brand: Raitool, No-load speed: 0-1350r/min, Color: Yellow, Max. Torque: 36NM, Voltage: 110-240V
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. I found coupon for you. Check this out.
Link: Banggood product page
1. ($60.62): BG589b2e
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG45dea1, BG45DEAL1, BGHONEY2110, BGfce528, BG4b4603, BGfa0606, BGc15a9f, BGc9c99c, BGc8e291, BG413877, BG1beeb8, BG72ec12, BG59f87b, BGSUPERATIO, BGbe4cfe, BGHU1637, BGGines, BGPHOOL8, BGHPT15, BGSaleFeb8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Raitool Electric Drill Screwdriver with 2 Batteries.
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)).