I could only find 78 on my book shelf, but there may be others hidden about.
Due to budget constraints, we usually waited for the paperback to come out, but not always.
As soon as we bought our ebook readers, and they became available in ebook format, we never bought another paper book.
This doesn't include the 15 ebooks we've purchased, which brings the *found* total to 93.
My apologies for the quality of the the photo. It was taken with my phone and I couldn't figure out how to focus on all the titles.