Hola OhMike,
I am a Sarita Montiel fan! Yes, La Violetera was in my heart her best movie. She must be in her early seventies and very well preserved!
She has good genes. She must have been in her early 20's when she did La violetera, so you can do the math!
Regardless, she was a fine actress and very well respected in Spain as well as the Americas. I now see her films in Saturday afternoons in Telemundo every once in awhile, but I have not seen them on sale in DVD's. Have you tried e-Bay? I buy a lot of my films from there.
Good luck on your search!