Have you ever checked out Bandcamp? It's a competitor to iTunes - a place to support the music you like. I feel that this might be a good model for you. Their

Have you ever checked out Bandcamp? It's a competitor to iTunes - a place to support the music you like. I feel that this might be a good model for you. Their niche is indie music, plus it allows for artists to be more flexible on pricing. I think there are a number of parallels when it comes to ebooks and supporting authors.