Am using Kaspersky Internet Security version 7.0, So I just checked what will be the cost if i do an upgrade to Kaspersky Internet Security 2009. I was surprised, it is absolutely free (up to the end of your license).

So if you are a user of Kaspersky Internet security or Kaspersky Antivirus you can upgrade to the latest version for free.

See the link from Kaspersky

You can find some posts in this blog which will help you to get genuine license for free (for version 7.0) do that and then do an upgrade to version 2009.