How do I find a contingecy based slander/defamation lawyer in louisville ky

I need to find a slander/defamation-contingency based lawyer in Louisville, Ky. My name-reputation and character were destroyed in a business establishment-by one of their employees. I do NOT work there-I was a customer. I am on disability and on a very tight budget-and unable to pay up-front fees for attorney services. Thank you in advance for any suggestions or advice that you can give to me.