I'm a bit aggravated at the moment. A few years ago (well, in 2007), a book called The History of the Hobbit was published, as a 2-volume box set. It was similar in nature to Christopher Tolkien's History of Middle-earth series, although it was written by John Rateliff, not CJRT. (CJRT feels The Hobbit to be only incidental to the legendarium proper and thus elected to allow this project to be farmed out to someone else).
I put the book on my Amazon wishlist and never got around to getting it, as it was always $60–75 dollars. As I am not the hugest Hobbit fan, that was always a little too pricey to me. Thus, it sat on my wishlist, and neither I nor anyone else ever bought it for me.
Since the movie came out, I decided to get the book. However, as fate would have it, it has apparently gone out of print and is now only available used. (I don't like buying used books online as you're never quite sure of the condition till you get it.) Then I learned that a revised, one-volume edtion was published in October 2011. I debated about that for a few weeks. I don't typically care for these one-volume editions of big books (it's over 800 pages) as they are unwieldy to hold and read. I finally decided, ok, whatever, I'll get that version.
It's out of print too!
I'm really surprised. I would never have thought something like this would go out of print so quickly.
Honestly, I would have read it only once anyway, and I was going to get it mostly as I am an incurable completist for things like this. I guess instead I will get the annotated edition of The Hobbit. It apparently contains a longer version of The Quest of Erebor, originally published in Unfinished Tales, and I am intrigued by that.
I think I will also get The Art of The Hobbit, which is a collection of Tolkien's original art for the book. I have two previous editions of Tolkien art, Pictures by JRR Tolkien and JRR Tolkien: Artist and Illustrator, but this Hobbit art book contains illustrations not included in the two previous volumes, plus illustrations previously published only in black and white.