What's the value of this camera?

I have no idea how to work this camera, I just have it laying around and would like to sell it. All that I know is that it is a Nikon FG.

Here's a picture.

This is a manual focus 35mm SLR from the early '80s, and the first Nikon to include programme mode.

While it isn't a bad shooter (and you can easily find a manual online) it isn't worth very much - see what they're selling for (not what's being asked) on ebay.

Not much look on ebay about $40