The range is endless
As with any item, you get what the buyer is willing to pay.
If you list somewhere like Craigslist that has a limited, local exposure you could get less than if you post on like Ebay where you have a much larger customer base.
Keep in mind, craiglist is usually local pick up, and you inherit the dangers of face to face meetings etc. Ebay usually involves shipping (which is paid in most cases by the buyer), and ebay fees, of around 15%. Still I did see a NIB D-80 with attachments go a few years ago for over $600. Remember this was a new in the box, never used, original in everyway machine.