Welcome back Brenda!
As you know the market is a little frenzied right now and 500's were never bottom feeders to start with. But one thing in their favor is that I got the feeling that the market for them is mainly those who are already turned one by Commanders, so a smaller pool. So although prices have gone up, they haven't gone crazy like the 182 or PC12 market has.
It's funny - 10 years ago when I mentioned Commanders on other aviation forums they were part of the fleet and the collective conscience. That's changed. Today the Commanders are kind of outsiders and many pilots I now encounter have never heard of them and/or are weary of them. Just yesterday I was talking to a Baron owner who's looking to step up to a turbine and he mentioned he's probably buying a MU-2. I said, "have you looked at Turbo Commanders?" and he was like "don't know anything about them, seems like the MU-2 is more common and a safer choice".
That same conversation would never happened 10 years ago - it would have been the opposite then.