It really depends on the part of the country you're in. I would suggest you visit edmunds web site:
http://www.edmunds.com/tmv/used/1990/honda/index.html . This is the link to appraise the 1990 Honda models. There, you can appraise the vehicle based on which part of the country you're in. It is better than the Kelley Blue Book website because edmunds gives you the true market value for the vehicle based on your location.
www.edmunds.com