It is available in a variety of ebook formats, including PDF,
which can be read on most computers.
The free review copies are available only from Smashwords; other
retailers will be selling both the ebook and the paperback
editions at the normal price.
This is part of the Smashwords Summer/Winter Sale, and a lot of
other ebooks will be available either free or at a discount
price, so have a look at them while you are there too.
I hope that, if you have not already done so, you will take this
opportunity to read my book, and also write a review, or at least
send me a personal critique, to let me know what you liked about
it and what you didn't like about it.
If you write a review, you may post it at the Smashwords site, or
on a general books site like GoodReads, on your blog, or, best of
all, in a literary journal somewhere.