There are reasonably priced online transcription services. They cost less if they do not need to certify as registered court transcriptionists.
Can you send a link for the MP3?
I'm just kind of disappointed that they don't provide transcripts. In the big scheme of things, the cost of it is pretty minimal, especially since the court will have a transcript produced. Why not provide it to the public, since the public is paying for it anyway? Besides, from an infrastructure cost, it's trivial to transmit a text file that may be at most a few hundred Kbytes, compared to a 140MB mp3 file.