City Navigator® North America NT
Part Number: 010-10816-00
Suggested Retail Price: $ 99.99 USD

You will need to unlock it to the serial number of your GPS. If you upgrade to a phone with built in GPS, the only way to use it is to buy Garmin Mobile XT where the maps are unlocked to the SD card instead of to a particular GPS (although there is a way to move them to your own larger card if you look hard enough).

Alan