When Singled Out was first published in 2006, it was not yet routine for books to be issued in electronic formats. So Singled Out followed the standard publishing model at the time of appearing first in hardcover, then in paperback a year later (in 2007). Now, just in time for Singles Week (September 18-24), Singled Out is available on Kindle.
I haven’t viewed the Kindle version yet, so if you have, please let me know how it looks (e.g., good formatting, easy to read?). Of course, you can still get Singled Out in paperback, too. Singlism and Single with Attitude (and all of my other books) have always been available in both paperback and Kindle versions. Links are in the Books section of this website (look at the very top of every page, above the doors and above my name).