Just to clear things up. There are actually two kinds of active suspensions that automakers use. Pure active suspension and adaptive suspension/semi-active suspension. Pure active uses an actuator to literally raise and lower the chassis independently at each wheel, while adaptive suspensions only vary shock absorber firmness to match changing road or dynamic conditions. These systems also have a many names depending on the manufacturer. For example, Mercedes calls their active system, Active Body Control. BMW calls their active suspension, Active Roll Stabilization.
You can probably tell by the difference which requires more effort to build and is the more costly of the two.