1988 mazda rx7 good selling price?

im trying to sell my 1988 rx7, i dont really know how much its worth though, its got a few scratches in the paint (someone keyed the door and its got a few scrapes in the paint near the back hatch from putting things into the trunk) other than that its in good condition on the inside and it cleans up well. its got about 144,000 miles on it. im the second owner of the car. i am trying to sell it but i dont really have a general idea of what it would go for.