On Radio Veritas you can get English mystery podcasts for free. Some transcripts of the show are available on the internet for free too.
The host Mel speaks very clearly and there are so many interesting interviews.
My favorite interview is this:
Transcript:
http://ufo-forum.2292404.n4.nabble.com/file/n4474002/The_Veritas_Show_Lou_Baldin_part_1.txt