I don't think anybody knows for sure, but there were about 11k made during the entire production run of the body. Thusly, I'd guess there are 4k left, probably less, given general attrition rate of cars due to accidents, then there's the rust.
EDIT: 30k, my mistake.
DOUBLE EDIT: Ok, 11k 3.0CS-es, I knew I wasn't making up that number.