The official DVD release is coming from Warner
http://videoeta.com/movie/36750/the-strangler/
release date: November 17
It was released on November 10, 2015.
This is a nice release, following the TCM/Universal release of two other mid-1960's black-and-white chillers, THE NIGHT WALKER/THE DARK INTRUDER. That double-bill DVD was released on November 3rd.
The image is anamorphic 1:85-1, for the first time on home video.