I need help finding parts for my car *Nissan Xterra 2004*?

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I have a 2004 Nissan Xterra, 4wd, engine model im not sure but i think it is a 3.3 e lite or something like that not very sure on that one... i need to find the Front Lower Ball Joint with the Control Arm i really don't care if it is used it would actually be better for me if it was used because it would be cheaper i am on a budget so i would like to find something i could afford and it is not too expensive i would appreciate any help or advice you guys can give me.. i have turned to yahoo answers as my last resort i have been searching all over the net thanks