Check the for sale section or buy on eBay. You didn't say what year your car is but that might help people find you a replacement part too.
On my 99, I pulled the amp when I replaced it with something better. I can check the part number when I get home. If it is the same, you can have it for $40 plus shipping as I don't really need it any longer. Got a shelf of parts I need to put up for sale one of these days, but the longer I own it the more parts seem to go on the shelf.
