Ray, actually they can be found cheaper. I brought brand new calipers and brackets for $175 shipped. The rotors I bought from R1 Concepts, drilled and slotted for $175 also. So for the full setup I have $350 total into it (minus the lines and pads).
You may have to do some creative searching to find a pair new or it's easier to find used, but 600 is way over what is needed to be spent.