Goodkindles is a book promotion site for authors and a place where readers can discover new interesting books to read. There are three promotion options available, Standard ($25), Standard Plus ($35), and Professional ($45) that allow authors to promote their books even with a limited budget.
You can read more about the options here: https://www.goodkindles.net/p/book-promotion-for-authors.html
Since 2011 they have worked with success with both self-publishing authors and acclaimed writers, and are a part of the marketing strategy of many book advertising companies and well-known publishing houses.
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Website: https://goodkindles.net