Where can one buy a new physical copy of a full (OT & NT) Protestant RSV where its NT is of '71? And are they even being printed nowadays? I have looked around and mostly found Catholic editions and some others, but not a Protestant '71 version.

Is there even one available with cross references?
The New Oxford Annotated Bible contains the 1971 RSV New Testament text (not the RSVCE).  As far as I know it is still in print - and available on Amazon.

It does contain the Deuterocanonical books set off in an appendix and labeled as "Apocrypha".