$19.99 – 80W/120W 110V/220V Rapid Heating 15s High Temperature 400°C Dual Power Ergonomic Design Electric Soldering Iron US/EU Plug Soldering Kit – 120W EU Plug.
Latest update shows that 120W 110V 220V Rapid Heating 400C Soldering Iron costs $19.99 (in Banggood). Check coupons or create price alert down below. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($19.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Is it expensive? From what I can see this price is higher than average price ($19.42).
Link: Banggood product page
Price: $19.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG45071d, BGd76771, BG09996e, BG94338e, BG4e0941
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 120W 110V 220V Rapid Heating 400C Soldering Iron is here. The lowest price was: $17.99.
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)).