I just looked online, no Carmax in AZ. CA and NM, but from the map, Meas looks to be smack dab in the middle of AZ, so prob too far.
Carmax is like going to the dealership, but they actualy buy and sell used cars, rather than take trades towards the purchase of a new car. I went onece with a friend trying to find out how much she could get for her Celica. It was pretty painless...they look at and drive the car, tell you how much they will buy it from you for, and you decide.
Of course, they want to make money, so they would go low, but you know that, and it would just give you an idea of what the car is really worth. KBB is good, but the local dealer will really know your market, IMO.
Perhaps there is a place like Carmax near you...there used to be another one here calle AutoNation...same principle, then they started to buy actual dealerships, then disappeared!
www.Carmax.com