I just bought one for about 85 bucks a few weeks ago. I've seen them anywhere from 80-150 or so depending on where you go. I got mine through the local auto parts store in town. Was a bitch and a half to put in on the ground, even with the car up on four jack stands. You half to disconnect the return line to make enough slack to slip the pressure line out from behind if, if your not gonna remove the heat shield. It's a real pain, but it can be done. I've got some picks of the job I can upload for you...they might help you out. Good luck with the project.
Also, I would recommend sucking the fluid out of the reservoir, or at least pinching off the return line just below it. That way, when you disconnect the return line at the rack, it doesn't bleed out all over you and the ground.