Are they available and any recommendations on reliable and reasonably priced companies?
Some podcasts offer transcripts. For instance, the New York Times gives a link for you to read or download a transcript. Others not so much. But you could use one of the captions apps, then save and download a transcript. Like AVA would do that, and it’s free for personal use.
You might want to give the Google Chrome browser a shot at it. It can create live transcripts that you can later save. Might be too much of a hassle, but it’s free. Since it’s not typed by a human there will be mistakes. You can looks for professional captioning services or maybe just hire someone on Fiverr.com