I have a CIG Weld 150, it does a pretty good job at sticking bits of metal together.
The only issue I had was the polarity was reversed when I got it, which threw me for a bit.
I only run gas, but cylinder rental is a bit of a pain each 3 months. I really should buy one.
Its a 15A job, but there is a 135 that I think runs off 10A available. If you don't have a 15A plug in the shed, then it is worth getting one fitted. Wiring in a new power point and circuit breaker can be a bit of $$, but if you have a surplus of double 10A outlets, then getting one swapped to a 15A might be an option?
The duty cycle isn't huge, but I haven't overheated it as of yet.
https://www.cigweld.com.au/product/weldskill-150-mig-portable-welding-machine/