This place is just a few miles south of the Baseball stadium downtwon, just Google Bob's Motorcycle's in PHX, AZ and it should pop up.
That being said, they do have the yard "organized" with Honda's in one section, Yama's in another, dirts and quads in another, etc.
Like somone mentioned before, great place to pick up metal bits, but awful for anything plastic or rubber.
Your best bet for parts is asking one of the grease monkeys roaming the yard for a part, they are usually more than willing to let you slip something in your pocket for a few dollars, versus paying the "whatever-i-feel-like-it" price the owner wants to charge you.
Although, carb rubber boots at $5 a piece was a bargain for me.