I hear scratching noises coming from the rear of my car when I accelerate?

Your local guy sounds right on. It is about a 2 hour job, and the parts should run about 60 bucks. So your actually getting a really good deal price wise. If you decide to go to your local guy, he/she should be able to show you with the car in the air the exact problem, as well as show you any recomendations he/she has for future service.