You can find stick welders real cheap off Craigs List.
Stay away from low-amp ones (less than 140A.) There are a lot of old 240 volt beasts out there that will run circles around new cheap ones. I see a Craftsman, Lincoln, Forney or Century beasts (>120 lbs) go for $100 or less every week or so.
Old, used they will still work as there is nothing to fail. Even if it was abused, there is what you will pay in copper in them as scrap.