it's about 45.00 for the engergy suspension front LCA kit. and about 4.00 for a tube of marine grease. if the ball joints are good thats about it. if the ball joints are bad. ie; torn boot you have to replace the ball joints as well. they are 51.00 a set here:
Chrysler PT Cruiser Ball Joint | Free Shipping | 2001 - 2005, Moog, Mevotech (get the MOOG they are usa made not cheap china shit) you'll need to press the old joints out and the new in. the new ones are serviceable. you'll never change them again. so i'd say about a 150.00 if you don't have a ball joint press and 115.00 if you do. also there is a nice write up over on ptcrew.com on how to replace the bushings in your LCA's. hope this helps. good luck.