No, that's WAY too much. Go to EBAY and you can find them for like $20, or find the tons of people here on the boards that are selling their stocks. Even back in 1994 when I had my stock unit, the going price was less than $80. For $100 you might as well throw in $25 more and get a real aftermarket head unit. Just to let you know, the extra harness adapter for a new head unit it like $15, or free from Crutchfield if ordering from them. If you are intimidated by trying a new head unit yourself, I'll tell you it's simple and straightforward with tons of help here to get you on the right track.
Good luck, happy new year,
Jon