Without any pictures and proper information on this vehicle I couldn't give an accurate price. But what I do know is that a vehicle is worth what the owner feels it is worth not what Kelly blue book or NADA can tell you. Their are far more factors to account for to find the realistic value of a vehicle. I see that your selling a 99 4x4 nissan frontier, you have a nice truck. Nothing special, kind of dime a dozen vehicle, that kbb or nada can give you an accurate appraisal of your vehicle. But what if you brought your truck to the body shop, had them fix any dents and so on, and gave it a minty paint job. Then after the body shop you brought your truck some where to have a lift kit added. Then you purchased mint condition black interior, seats, dash and door panels. All that said, purchased and done, what would your truck be worth to you then? Could you go buy kbb or nada. NO! Of course you couldn't. Why because you would feel its worth alot more, due to the fact not many out there these days are in clean, almost pristine condition, visually that is. You would price your vehicle according to what you think its worth and what would be realistic in todays market.