If you’re looking to sell our your own e-book then have a look at Jared’s post at Startups Open Sourced. He’s had great success with it and has written up a detailed how-to of the steps involved. One of his tips is, get your interviews recorded and hire a transcriber to transcribe everything which you can work off.
One of the things to remember while hiring a transcriptionist keep in mind the difference between audio hour and man hours, which Jared mentions in his post. An hour of audio can take anywhere from 4 to 6 hours to transcribe. If you’re paying by the hour then your cost will basically be multiplied by that factor. On the other hand if you’re paying by the audio hour, then the amount of effort spend does not matter. You’ll pay for the amount of audio transcribed and not time taken for it to transcribe.
On Scribie.com we charge always by the audio hour. You don’t have to worry about the amount of actual time taken. Even if the audio is hard to transcribe and takes a more effort, you wont have to pay extra. At the end of the day you’ll still get a high quality transcript of your audio file.