SermonSpeaker is free to use. However it's nice if you want to give something back.There are various ways how you could contribute to the SermonSpeaker project.
Read more: How to contribute
There are great users out there who created some nice video tutorials about SermonSpeaker. Here are a few examples:
Using SermonSpeaker with Your Joomla Website from Matt Sweeney on Vimeo.
Read more: SermonSpeaker Videos