I have checked all old coupons and price is 38.99 USD for 70W Soldering (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (38.99 USD)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it cheap? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 36.62 USD)
Link: Banggood product page
Price: 38.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGe61975, BG8FORMULAMX
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
Click here… to search for KSGER C210 70W Soldering Iron on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for KSGER C210 70W Soldering Iron is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).