Among a litany of things that need work on my "new-to-me" 93 4Runner is the exhaust leak I noticed at the header on the driver's side.

Unfortunately, most of the ones I'm finding a PASSENGER side only, for $125 or so, and they look like stock headers.
What's the deal??

Nobody like the driver anymore and wants him to die of asphyxiation?

Are you looking for stock headers or after market.?? I have a set of headers off a 1993 3.0 just sitting in my shop.

It all depends on price - and shipping cost.

I was just about to buy a $200 new stainless welded set on Jet.com

And since I wrote the above, I just spent 20 minutes reading an old post about the merits of "headers" vs "exhaust manifolds" and the questionable power gains, blah blah blah from 2011.
Apparently back then these things were cheap and easy to find...not so much these days. Also learned the difference between "headers" and "manifolds". I'm not a gear head, so I didn't know before.

So unless you're practically giving the old stock manifolds away, it seems like I'm better off spending the $200 on something new and stainless with better airflow than buying used that might crack and has stock airflow.

I went to headers to get rid of the cross-over pipe behind the heads. I also bought the stainless steel headers, they fit great, other then a tight fit by the starter and moving the transfer case cooler. If you ask me get the headers. Now the exhaust manifolds are free, you pay shipping. But I would get the headers........

I would get headers and ditch the crossover pipe behind the heads.
LCE makes headers for the 3.0