In search of a Mechanic or Auto Repair Shop

So my first call would typically be to my Car's dealership to get things done on my car. I've recently stopped after they quoted me $550 ($400 parts, $150 labor) to replace my drivers-side mirror, something that I got from AutoZone for $50 and replaced myself in 4 minutes.

My car is in need of a lot more. I need to get the drivers seat fixed(it's locked into place), my car speakers always short when using AUX, and my car alarm goes off randomly and I can't figure out what's the cause. My dealership said they would charge me $200 each to diagnose each problem. So $600- before they can even tell me anything. Of course I'm expecting the largest quoted price for fixing these things from them anyway...

These things are a bit out of my realm of trying to fix. I was wondering if anybody has shops or individuals they typically go to, and trust. Distance doesn't matter much, I just want to get my car problems solved affordably by somebody that's not trying to make generational wealth off of me.