Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (19.31 USD): BGMatt2022
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): AFfbG10, Parts8, BGVDay10%off, FBCOUPON1, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BG2ccadf, BGGAL8, BGJON8, BGRCParts8, BG1efeb0, MVC8SPRING
(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 Realacc Four Arms Aluminum RC Soldering Station.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).