I encountered an organization who strictly links to Amazon for ebooks. Christian Century Magazine links their readers to Amazon. You can only buy their ebooks in Kindle format. I wrote to them and asked them why they only offered Kindle formatted ebooks. Their answer was that Amazon donates 5% of the sale back to their organization.
So because of this arrangement, I cannot buy any ebooks for my Nook. Has anyone else run into this problem? Very Frustrating!
I have run into two other publishers who only publish Kindle formatted ebooks: Alban Institute, and Hampton Roads Publishing.
So now I have three organizations who are Kindle only.
I understand your frustration. Have you checked Christianbook dot com? They have ebooks and might have something you are looking for.