Help Mother of 2 with car repairs!

Hello everyone, I have been having a lot of issues with my car and today it gave up on me. I was able to get it to a shop where I was told it will be more then $500 to get my car back running. I am a single Mother to two beautiful kids, I work very hard to make ends meet. I dont have $500 to get my car fixed, we are struggling to make it now as is. I need a car to keep my job and get my kids to school, please someone help me. God Bless.