Guess I've never been snubbed "on the street" so to speak, mostly just by certain repro companies as you mentioned OY.
It's rarer than rare to see an F/M/J on the street. I can count on one hand the number I've seen on the street in the past few years. Mine would be one, a couple 5th's and,,,,,,,,,,,,,,,,,,,,,,well,,,,,,,,,,,,,,,,that's pretty much it. I do know there's at least a few F-bodies in the area, just never see them because they're never driven or just plain not driveable for one reason or another. As for J-body? It's been at LEAST 20 years since seeing one. I'm sure there's a few hiding away in garages though. Seeing F/M/J (or A/B/E for that matter) in a scrapyard is as rare as you can get. There are exactly none, nada, zilch, zero. Most that were in the yards were gone already by the mid 1990's save for the random M-body since they were built until '89. Last M-body I can recall seeing in a yard was in the last century. They all got totally picked over and what remained of the rusted hulk is now a water heater jacket or something. There might be a few pieces of the cars still sitting on the shelves of buildings at a couple of the yards but I doubt it.
