ATM you can buy 3.6V 5Nm DC for 30.99 USD (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (30.99 USD)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. But wait a sec… Is it a good price? Hmmm, price is higher than average (which is 29.68 USD right now), so better set price alert down below…
Link: Banggood product page
Price: 30.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BG20236Tool, BGPT07, BG8FORMULAMX, BGdd56ce
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
Click here… to search for 3.6V 5Nm DC 2000mAh 200rpm Electric Screwdriver Set on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for 3.6V 5Nm DC 2000mAh 200rpm Electric Screwdriver Set.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).