These are free to download. I got mine from itunes. Robert Ullrey put these podcasts together to use when you are doing the C25K program. Takes all the guesswork/watch work out of it, and you are just free to follow the instructions. You even get encouragement, and the music is energizing but not distracting.
If you haven't felt comfortable about running, or are intrigued about C25K, try this! I couldn't have started without it.