The actual vehicles used in the making of the film can be seen on the Warner Brothers' lot most of the time, though they're currently not on site.
I took some photos of it last year:

However it's a bit too big to put in my sitting room!
So instead I opted for this little baby:

As you can see it's got the "original" pre-spray camouflage colour. In the film Bruce Wayne sprays it black after being taken for a test drive.
You can get these cars from HotWheels, though there are shipping restrictions