Ben's bill exceeded the cost of a cooling system flush because there was a fee to check out his overheating problem. This was discussed before work had started.
Buying an alternator as a DIY project is naturally going to be much less expensive than having a professional shop install the alternator. I can't control the prices but I can provide the best service with best warranty.
If Bens Ford Focus continues to overheat we will be happy to take another look, and since he has already paid for a checkout that is guaranteed, there would be no additional fee to diagnose the concern.