Yeah its pretty much on par with KBB and NADA.
Actually I live in KC suburbs. so kinda close to you. And the GXP ive found is in butler MO. Ive done cars.com searches for 250mi and havent found much more. But I did find one I like in North Carolina lol.. My parents are the only thing holding me back on how far we will go to buy one. I love cars so I would go anywhere to get what I want. And I havent driven one yet but sat in a few and started them at some dealers around here and REALLY liked them but they were all newer and more $$$.