I don't think he was looking for some ghetto cruising air bags, I think he is looking for height adjustable air suspension like the Audi Allroad has among others.
It lets you lower the car a couple inches on the highway, and raise it up when you are going slower to avoid speed bumps, etc. Audi's system is speed sensitive, I have seen manually operated systems too.
At least I hope thats what you are talking about. If you want air bags you should have bought a 74 Cadilac or something :P
Three Words: More Cow Bell
Member of the "My last BMW had 462k miles on it and still ran like a monster so I bought another one" club.