First things first – what is an Aggregator?
Aggregators will sell your book to companies such as Apple, Barnes & Noble, Kobo etc.
In my past experience, the following aggregators are great to work with:
- Smashwords – eBooks only – http://www.smashwords.com
- Google Play
- Pothi – eBooks and Print on Demand
- Lulu – eBooks and Print on Demand
- Amazon Kindle – eBooks and Paperbacks
- Createspace (belongs to Amazon) – Print on Demand only
- Gumroad
- Xinxii
- Lightening Source – eBooks and Print on Demand