The best transcription services allow for the large-scale use of speech to text which has applications from everything from business to education.
The least expensive (and presumably generally exact) approach to translate a sound or video record is to do it without anyone's help. The greatest impediment of this technique is the time and exertion it requires. Between working over each word, setting up the right designing, and investigating the completed item, it's sufficient to guide the vast majority towards a die hard faithfulness.