Where can I find new EBOOKS?

I can't find ebooks on Amazon any more. I just keep seeing kindle book formats. Where can I go to buy electronic formats of new books to read on my computer? I use icebookreader when I can and enjoy the custom fonts and backgrounds that make reading very comfortable on my eyes without costing $400 like kindle.|||Ebooks.com is a great source for both fiction and non-fiction ebooks. Here's the link to their site: http://www.ebooks.com/