WOW! .. If I were you I would replace the sensor myself as well. That sensor is only held in by one 10MM bolt. It takes about 10 minutes at most to replace and isn't even close to worth the $ that they are asking. I agree on the belt as well, that is also something that you can do. The belt is a little harder than the sensor but with a few minutes and some patients it can also be done.

-Nate
98.5 SVT
3L w/juice