I have made an eBook version of The Darkest Years Volume 1 and it is currently on sale in my Blurb.com bookstore, here.
As an eBook, it is only available on the iBooks app and is only viewable on Apple iPads, iPhones, and iPods. (Sorry, no Kindle editions yet! I was disappointed, too!) You will need iOS 7.0 or later to download the app.
There is, however, a PDF version that you can purchase and download as well, AND you can open it in Kindle!
Print copy $11.99
eBook copy $9.99
PDF copy $9.98
–> My Bookstore