Garage door tech?

I'm looking for someone who works on garage doors who's not going to charge me an arm and a leg. I had to get new garage door openers, and when I just went to try and program them, the chain apparently jumped off whatever it's supposed to be sitting on. I'm off work due to breast cancer, I don't have a lot of money, and the last company that I was told about charges at least $150 just to come out and look at your garage door. So if anybody can refer someone, I'm willing to pay cash as well. Would greatly appreciate some help.