Find cheap airline tickets?

Someone please tell me how it is possible to find cheap airline tickets from ATL to FTL. I am an entrepreneur and new to the concierge industry. I have a request from a client to find airline tickets under $50 or anything near that amont from ATL (atlanta, georgia to FTL fort lauderdale, FL) Seems difficult but I am a strong believer in - nothing is impossible. ANYONE Please HELP!! I really don't want to loose a client.