what is a used, working apple IIgs worth?

I have an old IIgs, still works to my knowledge. There's another sitting in my mother's classroom that all the little kids still play the old school games on.

My old GS is back in my parent's closet, in working condition AFAIK..ahh nostalgia!

As for the value, I'd take a look on ebay and see what any are going for.

Is it one of the signed models? My friend has one with the Woz's signature inside the case.