John recently posted an article about how you can actually buy the original Batmobile, but for those without the cash, you can at least still go see the classic cruiser and all the other Batmobiles as well, including the new Tumbler from The Dark Knight Rises at an exhibit in LA created to help promote the DVD release.
If you can't make it to Los Angeles to see the cars, you can also always download the free Dark Knight Rises FX app on iTunes, where you can at least see a picture of yourself in the Tumbler, as well as put yourself in a Gotham's Most Wanted poster. The app also syncs with the Blu-ray, so if you're gonna get the movie, which is incredibly awesome, you should definitely download it.