If you scroll down on this page:
http://www.koboereader.com/tech-specs.html
It looks like (with select smartphones) you can sync via bluetooth between your phone and the ebook reader.
So I guess it is possible to buy books on the go? Buy the book on your smart phone and then wirelessly sync to the Kobo reader?
That actually is pretty smart, use your expensive and already connected mobile phone and wirelessly sync it to a cheap, single use ebook reader.