Check as many places as you can/. I was shocked to see the 61 note Tyros 5 for $3600 in a Sam Ash Store here in NYC. Which was about what i paid for it new years ago.. If you find a few 970'd in the same price range. that's it.. Sorry I can't tell you a specific price. Of course, original packing, manuals, condition are big factors, Certainly a store will overprice it..
Music stores here will tell me, to sell my used instrument because they what ever you trade in, they want a 50% markup..