Audio files for Spoken Standard Chinese (SSC I and II)

[Qaamar]

I am looking for audio for Spoken Standard Chinese (SSC) Books I and II by Stimson and Huang, originally from Far Eastern Press, later Yale U Press. The books are still available, but the audio (cassettes) are no longer sold. I am hoping someone has MP3 files they would be willing to share or even cassette tapes for sale. Any help with this would be much appreciated.

There was also audio recorded for the associated workbooks written by Vivian Lu. Unlike the DeFrancis books, where audio was saved and is available on the Seton Hall website, no one seems to have preserved the SSC audio which was as I remember it exceptional in quality.