The median asking price for a used one is $21.40, measured across 41 live eBay listings for the 2008–2013 generation. That is an asking price, not a sold one: eBay's completed-sale figures are behind a limited-release API, so this tool measures what sellers want and says so rather than dressing an ask up as a sale.
This copy of the site is running on generated sample prices rather than live eBay data, and every screen says so.
That depends on what the yard charges for it and how long it takes to get off the car, and on where it sits against the other 60 parts on a 2010 Nissan Maxima that have a market. The full sheet for this vehicle ranks all of them by what you save and by what each hour is worth.