What would be a fair estimate to replace the oil pump(new & used) in this car including labor? I understand prices can vary for several reasons. Replies estimating $ for the NJ/NY region would be most helpful, but allreplies appreciated.

You may visit http://www.abcnissanwholesale.com/
To find out the price for your need. I have Nissan Altima'96 and they seem to offer low prices for any Nissan parts.