Possibly a great deal for those in the US: 10 Principles (Charles Stanley)
Found a book for $ 0.99 today scrolling through the ebook store: https://ebooks.faithlife.com/products/10563/10-principles-for-studying-your-bible
This book by Charles Stanley looks very interesting (went over to Amazon to get more info, found over 100 reviews averaging at 5/5, the print version has 160 pages and sells for $10, the kindle edition for $7 or so).
Unfortunately, as seems to become the norm rather than the exception lately, when I had put it into my cart and hit quick buy, the usual message appeared:
I know, Faithlife can't go around the ridiculous regional licensing that plagues ebook publishing, and I'm glad to see books in the store and hope many customers from the US take advantage of their availability and of occasionally great prices.
It just feels so much of a letdown to have taken the buying decision and looking forward to seeing the book in my library and then to be told "April, April, you've been fooled again". I'd wish that every book that has a geo-restricted license would say so very clearly on the product page.
For those who can, I wish you the very best with this!
Have joy in the Lord! 
