air shocks on a jetta IV

on the way to this little car show this weekend:i was at the stoplight and this black jetta pulled on the side of me.i was like whatever my car is tighter than yours.all of a sudden sssst!!it dropped alllll the way to the ground.i was like daaaamn thatz tight.i didnt have enough time to get to him cuz he took off but i was wondering if anyone on here knows how much airshocks cost and where i could find some.thanks