Several months ago I made the decision to avoid, as much as possible, buying books in favor of ebooks. It was a practical matter. Besides the obvious benefits of cost and convenience, there is for me the practical reality that I simply have no more room. My church office is packed, and since moving into a much smaller home there is little room there.
Yet there is the frustration when you hear about a book you want, for instance http://www.thehousestudio.com/store/thin-places/, and you see that it is not available as an ebook.
Have you changed your book-purchasing habits?