I don't know if this helps provide a reference point, but a couple of weeks ago I bought a near-mint GSN at an antique shop for $25. No case, no lens cap, no manual, but the camera appears to have seen very little use (even still has the little clear plastic guard in the hot shoe). Maybe it wasn't used much because the previous owner put a 3 volt battery in instead of a 6 volt. No corrosion in the battery box, though. I do have to replace the light seals, and condition of POD is unknown at this point. OTOH, another GSN at a different booth in the same antique center, which saw substantially more use, was marked $35.