Good place to get an oil change that doesn't over charge for one? And GO!

Good evening, I'm looking for a reputable mechanic! I have recently change my brake and rotors in Nov/Dec. But I am hearing a grinding sound and it started to squeak today really loud. I've had the mechanic check and test drive it and nothing. So I brought it to another and they say the brake pads are bad.. I want a 3rd and 4th opinion. Please someone help.