Direct from Chinese sellers working from I phones in a closet, that's where
https://www.aliexpress.com/wholesale...default&page=1

And if you want a machine, 90 pages of machines, some with knobs and others with push buttons and even digital readouts.
You won't even need 6 years of Mandarin lessons.
https://www.aliexpress.com/wholesale...welder+machine

Now you know where the good deals on ebay and Amazoom come from