Southern Air is $5. No excuses..buy it if you haven't already!
Edit: Just noticed that Amazon has implemented a one device per account for their MP3s. For example, if you download a song from your laptop to your account, you're ok. If your sister wants to download a track from your laptop under her account, authorization from your laptop has switched to her account and her account only for 180 days. That means, only her account is allowed to download from your laptop. Sorry if that was a hard read lol.
You can read what this guy has to say about it and his experience with Amazon's online tech support. http://www.leisurelyhistorian.net/am...vacy-nightmare