What is the cost of replacing brake pads rotors and calipers?

Don't know about calipers - have never needed to replace those.

If you are replacing, yourself, the parts (pads and rotors) will cost anywhere from $120 up for front pads and rotors (pads $20 up for a full set, rotors $45 up each). If you check the web, there are some sites where you can order an entire set (pads and rotors) for around $90.