Rockauto.com says $42 to $75. Seems a bit high to me though. If you're hoping to do this yourself, you'll need to get "quickstruts" that come fully assembled with mounts,bearings, springs, bump stops, dust boots, and new struts. Otherwise you need a spring compressor and doing it wrong can put you in a coma if you live through it, that said, for possible liability purposes I have no idea how to replace just the mount

. We always do quickstruts at the shop, it works out to be about the same price for the customer because they're paying an assembly line worker to assemble them, and they get all new parts. Definately the way to go, especially considering how spings like to break. Not so much on Cavaliers as other cars, but I have seen a couple.