The Boxster' brakes gets a lot of use, so the pads tends to wear out faster than normal :-)
Having the dealer change them will run you about $300, but they are so easy to change that it's worth the effort to do them yourself.
It's best to invest in a good racing jack... it'll save a lot of time in lifting and lowering the car.
1. Difficulty - Medium
2. Time - 1 hour
3. Tools - hammer
4. Cost - $100 to $150 for pads