Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Suitable material: stainless steel / carbon steel / low alloy steel / cast iron, Output amperage: 20-250A, No-load voltage: 65V, Rated frequency: 50/60Hz, Power Factor: 0.73, Duty Cycle: 60%, Power factor: 0.9, Input voltage: 220V, Rated input current: 25A, The best welding plate thickness: 3.2mm/ 2.5mm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
1. ($42.22): CityadsTool
2. ($46.69): BG00c906
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAFF10OFF, BgcLuBofErtA10, BG85506, BGHONEY2110, 13f142, BANGGOODSD, BG8a7644
(these coupons are old, so probably won’t work)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was $41.39 though.
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)).