Where did you see that info from? Because in this video, it shows to be a normal sports car height. Unless you mean when it is not in attack mode or something.
Ben Affleck Surprises Fans in Batmobile - SuperHeroHype
Re: HOT TOYS : MMS DX 12 - The Dark Knight Rises - BATMAN / BRUCE WAYNE Full Specs &
afattori is selling one for $325 shipped. Might want to search around the sale forum.