Try a search for "ball joint", the price you were quoted sounds pretty high to me. I think many have done this type of job themselves..... might need to get a shop to do a small part of the work where a press may be needed. Good luck.

__________________
1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k