I have been finding some that I look at to be the opposite, there was a 2003 X. The asking price was $8400, KBB had the value at over 11K. I would assume the prices people are selling their Jeeps at, depends upon the mileage and condition. The one I was talking about is clean, but the miles are a bit high, I think it was 122,000.
I was once told by someone, the book does not sell the vehicle.
And I would be hard pressed to pay more than 8K even though it is valued higher, I am chomping at the bit when I can finally get back in a Jeep again, so I like to look.
Good luck in your find and keep us posted.