I thought some list members might be interested, the Harbor Freight autodark helmet is on sale for $49.00.
Go to
This model looks like the exact same one I have, and I've been happy with it. It's solar powerd and has the darkness adjustment knob on the outside.
Just so you know, I got one of their cheaper autodark helmets, w/out the knob on the outside, and it was hard to see out of. I'm not sure I could describe why, it wasn't too dark or anything, just not at all "clear".
This one, the more expensive HF helmet (with the knob on the outside) has worked like a champ for me, and I'd reccomend them to anyone who doesn't want to spend a lot on a helmet. I've been doing stick welding in class, about four hours at a time, and haven't had any problems with my eyes feeling "burnt" or anything.
I think the only problem I've has has been the head band gets knocked "out of size" easily, but its not a big deal to me.