Free or Cheap Christian Fiction:
I put up all the Christian Historical Ebooks that go on sale or free that I know of on my Inspirational Historical Fiction Index Facebook page.
If you want to see more genres than that, almost all the on sale and free ebooks I announce come through this blog: Christian Fiction for Your Kindle
Keep up with all the Christian Fiction giveaways that pop up all over the internet at this blog: Fiction Addiction Fix
If you are trying to get my books for free, when I’m having giveaways, I post them on my Facebook Author Page. And if you subscribe to my Author Newsletter, opportunities to get books from me when they happen are sent to my newsletter subscribers and I have occasional random giveaways for subscribers too. (I only send out a newsletter when I have big news — I don’t spam you or sell your address.)
If you are willing to review books in exchange for one and have a blog, you can sign up with Netgalley or see if your favorite publishers offer a reviewer’s program. This of course is subject to approval and your continuing to meet requirements. My publisher, Bethany House, does have a review program.
If you are interested in free public domain kindle history books that would be good primary sources, check out my Pinterest boards. There are several boards for primary source diaries, cookbooks, medicine, etiquette, etc.