This thread is giving me a headache because it is making something very simple seem to be very complicated.
The bottom line is this: I'm not aware that any of the major manufacturers of revolvers currently produce a ".38" that is chambered for anything other than .38 Special. I'm guessing here, but it's probably been five or six decades or more since Smith manufactured a handgun chambered in .38 S & W and I'm not certain that Ruger, Taurus, or Rossi ever made a gun chambered in that caliber.
I also think that nearly all of the currently manufactured ".38's" will handle .38+Ps but its pretty easy to check that out with the manufacturer of the particular gun.
So, if you have a new or recently manufactured handgun that's a ".38" Special you can confidently assume that it will handle .38 Special and it's reasonably likely that it will also handle .38 Special + P ammunition.
Furthermore, .38 S & W ammunition, as opposed to .38 Special is not that easy to find. I suspect that most stores that sell ammunition over the counter don't stock it, it's a specialty item. I've never seen it in WalMart, that's for sure.