If you do not have any console game, you can download the game into your personal computer. Where you can download the game for free? Actually there are so many websites that provide free download feature for NFS Underground 2. You can choose one of the best websites and download here for free.
You also can buy the original DVD and install it into your PC, but the price is a little bit expensive. So, it is recommended for you to download the game for free through online.