I needed the same thing when I bought my 06 a few years back. The updates consist of a dvd with map and POI updates, no software updates per say. You can buy them from navteq for $170ish unless you catch them on sale which is usually after they have been out for about 6 months or the next update is about to be released. You can also get them on Ebay if you want an update thats a year or 2 old but they are still sort of expensive there too. You can also download the torrent for the update from something like pirateb@y and then try to burn it to a DL dvd (must be a dl dvd to work) with the proper burner and software. They dont really let us talk about copying discs etc on the forum though.
Send me an email and Ill walk you through a few options to get you the update.
[email protected] My name is Stephen
Welcome to the forum by the way, post some pics of your new ride if you havent already!