I have checked all old coupons and price is $21.99 for BS45 Portable Soldering Iron 16-20W (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
BS45 Portable Soldering Iron 16-20W Adjustable Voltage 320-450℃ USB Charging 2600mAh Battery Quick Heat Up High Temp Resistance – C
Latest coupon and price update (UTC):
Banggood ($21.99)
Banggood warehouse is located in China. There are no coupons for this product in Banggood. Isn’t it too expensive? Let’s see… Average price for this item is $23.37 and current one is $21.99, so it’s a good price!
Link: Banggood product page
Price: $21.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for BS45 Portable Soldering Iron 16-20W? There we go.
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)).