at the bottom of his post he makes a coment $600 or less,I think what everyone has said is just a tad over that budget and remember to add in for the gas tank,wire, ect..
for under 600 you will get a 115v wire feed welder in a lincoln or miller, i had a lincoln that i got at home depot, you can get one for around 400 to 500. Then if you get the 115v get a 50 heavy extension cord ,I got that at home depot also it was 50 bucks, let him practice with the flux core wire where no gas is needed untill you can afford another 125 for a tank of gas. a great first project would be a nice wheel cart for the welder itself.
my
btw I have been a welder of mild steel and stainless for 20 plus years