How to I determine what my Nikon D300s is worth?

I'm going to sell my D300s camera body, and I wondered if anybody could assist me with determining what it's worth.

Purchase date: 02/04/2010 from Adorama

Shutter actuations: 74,796

I took it in to have the sensor cleaned and have it recalibrated earlier this year.  I have the original box and all the accessories that came with it.  Really, the only signs of wear that it shows is on the AF-ON button on the back of the camera.  I've always used that to focus instead of the shutter release button, and the white "F" and "O" letters are slightly faded.

Thanks in advance for your assistance!

Bob Olepa