got mine at Auto Zone for $70 total w/ tax. it was $5 cheaper than kragen...had to special order it...but arrived on friday and put it in on saturday. it was a b!tch to get at. and how hard are you suppose to tighten it anyways?
One thing to tell you, the Standard Ignition O2 sensor is the same one as the Nissan OEM one. It has the Nissan logo on it, plugs perfectly fit around the car and also had that little tap for the wire to hang around the ngine