I would start at $700 and go from there, demand will tell you the price. That said now all I have to do is search out your posts to low ball a $600 offer . Not interested in the scope just saying this thread put your value at $600 or less now.
The market decides. Watch eBay or the classifieds here and see what that scope sells for. Also do a search to see what prices vortex scopes have got in the past.