Depending on what you are wanting to spend, take a look on craigslist and see if you can find a decent used MIG welder. Now you can use solid wire with a shield gas, flux core wire with out a shield gas, or dual shield.
If you want something new, maybe look into a hobart at tractor supply, it is the same thing as a miller but watered down feature wise.
Ah, now that's the piece of information that always seems to get misplaced. So it's not worth running a Mig Welder if you'd only be doing flux core wire? I just don't want to be dragging around a big bottle for my small amount of work.