Greenleaf Publishing is a traditional publishing house, so there are no 'upfront costs' to the author. This means that they do not require you to pay to have your book published - they will cover the costs associated with producing and distributing your book. As an author, however, you will have to cover additional related costs, such as:
• Editing and proofreading fees, if you require these services.
• Cover design, book design and formatting fees.
• The cost of any ISBN numbers you might need.
• Costs related to launching your book. This could include fees associated with, registration, printing marketing material, creating social media accounts, running ads and promotions, etc.
Ultimately, it is difficult to give a definite answer on how much it would cost to publish with Greenleaf. Much depends on the type of book you are writing, the services you use and how much of the work you are able to do yourself.
More information is available on Greenleaf's website at: https://greenleafbookgroup.com/author-services/publishing-packages/