Is there any web site or book that gives an idea on what to expect when you go to buy parts for a car ? I tend to keep my cars about 10 years and am amazed at the prices of many of the parts, e.g., "2004 Nissan Sentra “speed sensor,” $350.00 !
Any of the majors have on line parts look up and give pricing. Rockauto is a good one as well as NAPA.
I’m looking right at the Auto Zone web page that says 185.99 for that sensor.
Yours sounds like Nissan list price.
Maybe different by geographic area and supply chain but dig a little deeper.
You can also try The Auto Parts Shop website. It sells good stuff at low prices.