Throw an advert up in Weldingweb and the Hobart forums too.
Also, I can't tell someone to wire something not according to electrical code in a public forum since people tend to **** that up, but my LARGE Miller 340 runs fine off a 50A breaker off a roughly 30ft cord. It sits in my shipping container shop and I don't plug it in unless I'm gonna use it.
Your call, based on your degree of electrical common sense. I would run it without hesitation.