Link won't go.Outside of finding a brand name used, being given away, I think your only option is to roll the dice on one of these with an extended protection plan, and keep returning them until you get one that works.
I don't remember if it was plasma cutters or welders that Project Farm was reviewing - I think it was under $150 stick welders - but he gave a rare Reject! evaluation to two of them that didn't claim overload protection and in fact caught fire and died at well below their rated output. That would be a rude surprise for an unsuspecting new owner!Yomax is right on as usual. Almost all of the cheap inverter welders and plasma cutters that are reviewed and tested are actually lower in power output than they are rated. Lots of the cheap welders that claim 200 amps actually are less than 150. Plasma rigs are the same.
No doubt Hypertherm and Thermal Dynamics are the leaders in plasma cutters but they are outside the budget for most home hobbist.
I did watch a showdown of cheap rigs put on by "Project Farm" which was interesting and great info for a buyer. He is a great source of info before buying just about anything and will compare just about anything viewers suggest.