@IanC They're about $40 each. The last time I got one, I got a set of two for $75. Second one is still in the garage I think.
It's not a difficult job. Lift the car, remove the wheel, caliper and rotor, unplug the wheel speed sensor... typical stuff.
I'm going to go ahead and install the remaining one and see what happens. They're not getting a good review, though. :D