Depends on the Type of ebook reader

When the Kindle first came out, all of you buying books could be done from either the kindle or your PC. However, the update to the Kindle was by WisperNet. That is, SPRINT 3G service that is paid for by Amazon. Today, when you buy the Kindle, you can get the Wireless version or the 3G version which runs a bit more. The 3G is WhisperNet (you don't need an account with SPRINT). In your case, I'd go with the 3G until you have a wifi connection. If you get a WiFi connection once in awhile, such as over at a Starbucks and you don't mind waiting, you can probably go with the Wireless but it's a piece of mind to have the 3G version anyway.