Replying to Car Stereo

So a little over a month ago I brought my car in to Best Buy because there was no power going to my stereo and I wanted it fixed. After about 5 minutes of running tests on it they told me that one of the wires was fried to I was getting no power(already knew that but thanks) and told me the only way to fix it would be to get a new radio. My question is for the car guys, wouldn't I just need to get a new wire harness with new wires instead of replacing my entire stereo and wasting $120+? +K for helpful answers or ones that make me laugh.