How much could I get for this receiver?

[BobT99 10+ year member]

Or better yet, how much is it worth? I bought it 4 years ago new in box, it was originally a 2008 model and was leftover stock at a warehouse from a large online dealer. I never opened it because I was planning on installing it once I got a new car, but they didn't make an install kit the car that I ended up getting and so it's just sitting here. How much could I possibly get for this? Thanks!

http://www.sonicelectronix.com/item_17693_Pioneer-Premier-DEH-P510UB.html

Here is the link to the product on Pioneer's website. It says the "suggested price" is $249.00 but I'm 99% sure that was its last selling price before it was discontinued.

http://www.pioneerelectronics.com/PUSA/Car/CD-Receivers/DEH-P510UB

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