Power Supply Plug: DC5525, Power: 65W, Input Voltage: 100℃-400℃(MAX), Data/Power Interface: Micro USB, Power Saving Temperature: 200℃(Initial setup), Preset Temperature: 300℃(Initial setup).
Basically copy coupon, view price history or create e-mail price alert. Best price?
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($43.06): BGRCParts8
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGFlipskyTS100, BGRCPART, 502C6B, AFfbG10, BGCITYADS2019, BGVDay10%off, BG10PARTS, Parts8, BGCityadsRC8, Tabby20
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for FlipSky Mini TS100 Soldering Iron. The lowest price was: $37.39.
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)).