If you want to get your work out in the simplest possible way at the lowest possible cost, consider Smashwords.com. You put your lightly-formatted Microsoft Word document into their engine and it converts it to Apple iBook, Barnes&Noble Nook, Kobe, Sony, and many other formats. Then Smashwords will distribute the eBook to all the different publishers AND take in all your royalties and display it in a convenient dashboard.
It’s simply the easiest way to reach the non-Kindle marketplace! Be sure to read their guides for formatting (no tables and no fancy fonts). And get published right away!