Originally Posted by Mr. Wizard
There is a website http://www.lowbucktools.com/
that sells functional equipment at really good prices, a lot of info in thier catalog as well. As for a welder you might want to read this page from my website
Be cautious of "flux core" wire for thin materials.
I will be honest harbor freight or northerntool migs are quite useful as long as you watch the duty cycle.
Personally if I were looking for a sheet metal machine on the cheap I would by a cheap one WITH gas input and get a bottle of 75/25 AR/CO2 mix and learn to be a really good spot welder . Use .023 solid core wire. You will be amazed what you can do.
I've noticed flux core produces a lot more spatter but I just assumed that I was blowing holes in material because I was running too hot, moving too slow with the handset.