wobbly front end

Over the past few months the front end of my 04 tj X, has developed some play in the front end. I put it up in the air and sure enough with the wheel locked there is a little play in each wheel. The jeep has 72k and has seen 85% street use. I'm dropping it off at my mechanic today but just wanted to hear what you guys think... Ball joints? Steering stabilizer?? Shocks?? How much do u think replaceing ball joints will run me?? Thanks