I have the paperback version on Amazon. You can find the kindle version there, or pretty much any ebook version on Smashwords. They also distribute the appropriate file type to Barnes and Noble, iBooks, Kobo, etc.
The paperback is set to $11.99 (though Amazon often has it on sale), and the ebook is $2.99.
For visiting my website, take a dollar off your purchase at Smashwords! Just enter the code SY47R to get the deal!