The eBook is available on Amazon and Kobo.
Amazon sell the Kindle and Kobo their own ebook device.
With regard to Amazon, there are many devices that read Kindle eBooks, including phones, tablets, laptops and PC's.
All you need is the appropriate Kindle app, and these are available for Andriod, Apple, Microsoft and Mac.
The easiest way to download these is from you device, using a wifi connection, preferably at home, or using your roaming connection - but be aware of data charges.
Links to the apps are shown below:
Android: Tablet Smartphone
Apple: iPad iPhone iTouch iMac
WIndows-8: Tablet Laptop/PC
Nook: HD HD+