D2D – or Draft to Digital is a formatting and distribution service, much like Smashwords It costs 10% of the retail cost.
You upload your document (.Doc/.Docx, and RTF can be converted. ePub are distributed as is) check a few screens and then it can be sent to:
- Amazon (KDP)
- Barnes & Noble
- Kobo (including Kobo Plus)
- OverDrive (libraries)
you can read more at their FAQ.