I always (or almost always) check my books out from the library. Not only does it support my profession as a librarian, but it also saves me A LOT of money! However, if there is a book that I really enjoy and that I think I will reread then I will buy it. My e-books usually just sit on their digital bookshelf until I’m ready to pick them up again. My hard copy books I try to share as much as possible. The books that I just decide are taking up room on my shelf because I will never touch them again get sold to Half-Price Books or donated to the library. I guess there are lots of options as to what we can do with our books, but for me it depends on how much I liked the book where it will ultimately end up.