Honda fourstrokes are still common in Holland (where I live). If your C90 is rotten, ugly, doesn't run and such it's worth about $200. over here. If it runs it's $300. If it runs and looks ok and is in a reasonable condition it's about $600. A C90 in topcondition is worth about $1000 and the revised models (new engine, new barings, everything as good as new) cost about $2000. I know that Honda fourstrokes are very rare in the US so if I were you I'd ask a little more. They can't get it any cheaper anywhere else because they're not available anywhere else, right?