How much would a "blue" and tan pitbull go for?

I ask out of pure curiosity. I've seen puppies that look like him online and they seem to be highly sought after. This guy was found on the streets as a puppy and soon adopted by this family that brings him to my work. He's thick. That's the only way I can describe him. He's like a tri color, but without the white, there's only a small amount on his chest, and replace the black with the blue. Again, this question is not malicious. I'm against breeding dogs, and am an advocate for adopting.