so … where can i get one ?
i have one!!Has yur name written all over it 
http://www.n-e-c-c.com/forum/viewtopic.php?t=7001&highlight=
hmm … used … for how long was it used ?
I cant say for sure the car came from japan with this part installed. If you want new you can get a 300zx 02 sensor from autovalue for about 120$
hmm … auto value eh.