air ride will have a kit soon.........
www.airride.com
as far as prices and products it depends on whom you go with. you could get by on the cheaper level for roughly 1500 in parts with air ride technology...slightly less with chassis tech and air lift. of course this is just using the standard bags all around with the slower valves, smaller compressor, analog gauges, etc.
i really don't care for the strut designs of the other companies but air ride makes a really nice setup with their cool ride kit. if you go with the upgraded version using the billet struts though figure at least a cool 1,000-1200 just for the air struts.
their big red valves are really nice although they are expensive. going with a smaller 1/4 type valve like the ridepro setup will be alot cheaper. there are lots of companies that sell valves though so shop around if your looking to go cheaper. supposedly
www.xtremevalves.com. makes a really nice valve that is even faster then the bigred but i'm sure you'd have to pay for it.
you can save alot of money doing the installation yourself as well as picking up as many of the necessary parts from a wholesale place. be prepared to spend some money though. also going 2 way instead of 4 way will save money in valves and line...however the car won't handle as good.
if you really want the fun parts. digital guages, 4 way remote setup, 3/4" capability, fast valves and good electric compressor figure on roughly 1,700 in just parts and then you would need either your bags or air struts.
here are a few more sites to get you going.....
http://www.airbagit.com/ http://www.gaugemagazine.com/