If you still have the book, it has a code on it that you can send to viva media. They should be willing to re-send the online code to ya. Might be worth a shot. Amazon canada still has new gt legends it looks like. Otherwise GTR2 is another popular simbin title that has many free add-ons such as power and glory(kinda like gt legends for GTR2) if you like the old iron.
Then there are the steam releases like Race, Race07, GTR Evolution. Do a little research on above titles, pick your poison, and dive in. 
Unfortunately, my copy had no code in the book or on the jewel case, whichwas the original problem I had. At the time I found a FAQ or forum post about that problem, which is when I contacted support. I received an online code, but IIRC it didn't work which is when I decided to shelve the game for a while - didn't think at the time the shelving would last 3 years.

I checked Amazon.ca, but the cheapest price is $50 which is a bit steep considering I originally only payed $30.
I do prefer retro racers and I actually still play the long-in-the-tooth Rally Trophy because of it.
I'm concidering GTR Evolution or Race07, but I'm a bit hesitant since my gaming rig doesn't meet all of the recommended requirements. Honestly at this point the very-long-in-the-tooth GPL is looking good. LOL.