you'll never get what kbb, edmunds, or black book is giving you at the dealer UNLESS they are making more money on the car they are selling you. generally a dealer will lowball you $3k+ on a trade in or more. If you get $1500 below trade in thats considered a good deal.
sell the car on craigslist. I sold mine after about 2 months on there for $500 less than what I was asking for it in liquid cash.
Dont meet up with people who are too eager to buy the car. 9 times out of 10 they will waste your time and they are trying to lowball you to resell the car.