I was reading that you can hook a TIG torch up to a stick welder to cut a lot of cost off the TIG investment. :weld: No high frequency starting and you still need a bottle of gas, but I've been thinking about trying it. My father has a Lincoln buzzbox I can power it with. He also has a little Lincoln 110 MIG that I use. If the metal is spotlessly clean, I can get smooth beads on ferrous steel with it. I also tried a spool of stainless wire on some 316L stainless tube and it worked really well(even with the wrong 70/30 gas mix). That low carbon stainless can take a buttload of heat without blowing through!
Then again, Harbor Freight had a basic TIG welder on sale for $200 a few weeks ago.
There was also a whole writeup on a site I frequent by a guy that used an electric motor and a 130A alternator to make a DIY DC TIG welder.