Unfortunately, Amazon has chosen to get rid of light novels if they contained lolis in them. So I feel it's only a matter of time before they start going for more and more anime related material.

I don't know too much about services that are cheap. I'm pretty sure that a fair bit of legitimate self publishers have costs associated with them. But if it's just ebooks, then it's probably not too high. I'm not sure, but feel free to private message me if you want to talk more about it. This is a topic that I enjoy looking into.