Is it new or used? I'm not really sure how old it is so i'm not sure on how much it would be worth, but i found one on EBAY for 25 bucks. Used cd players are cheap. If you don't find a good answer here go here and post a message in their car audio forum, i'm sure they can tell you what it's worth.
Hope this helps ya
EDIT: If it's a 98 model it isn't worth much more than the 25 bucks they are selling it for on ebay. Just my 2 cents.