From the official notice on the Judicial Branch's homepage:
Effective Nov. 1, 2018, audio recordings of Judicial Branch proceedings that occur on or after Nov. 1, 2018, and are publicly disclosable will be available for purchase at a cost of $20 per day per docket number. The rules and procedures governing access to court transcripts will govern access to audio recording.
There is additional information available about this new program in the policy and procedures regarding purchasing audio recordings.