First, thanks for the discussion! Good points about avoiding refurbished items, being aware of Amazon price gougers, getting a card before Thanksgiving, and I now better understand the nature of Lutfij's question about merchants. I'm an American buying from the usual US markets.
Someone mentioned "private" sellers of cards, but I wasn't sure if these were new or not or where those were found.
Let me ask a better more specific question.
I'm looking for a new, not refurbished, video card that is compatible with my build. If I could find an Nvidia around $50-$75 that at least matched the performance of my R9 290 Tri-x (which is factory overclocked), I would do it. I'd be willing to spend maybe up to $150 if I can be convinced the performance gain is worth it. However I think that's unlikey because other aspects of the build, CPU, sys Mem, bus speed, etc.. are likely going to serve as bottlenecks.
As I mentioned, a Tom's hierarchy chart from 2014 showed my R9 290 on par (or slightly better than ) a GTX 780. That and a few "levels" of hierachy above that (perhaps with more vram) would be the target zone.
My guess is that my budget is too low to find anything, but I'm having a hard time determining that becuase I'm having such a hard time finding prices on anything new. Of course that's not surprising being I built this thing 9 years ago.
So a big part of my question isn't just what to get, but where, specifically to get it.
I'm pretty sure you'll tell me my budget is too low or that cards that old can't be found. That's okay. It's good information and will let me move on to other options (like planning my next $1500-$2000 build in 2024).
Again, sorry I wasn't more specific about what I wanted at the start of the post. I was still working it out in my head and your responses helped me get there.