Office Chair - Mid Century Style

I'm looking for an older style office chair to refurbish.  I've mostly looked on e-bay, but the ones I'm finding are pretty expensive.  So I though I'd check and see if any of my friends might have an old chair in storage they'd sell me.  Or maybe you'll run across one in a garage sale.

Anyway, the condition of the seat padding doesn't matter because I'll have it taken off and restored.  But the type of legs/wheels does matter.  And it does need to work.  Hopefully the wheels will still move smoothly.

So, if you come across something like this (note the style of the legs), let me know.

Legs like this.

Or like this.

But not like this.