I haven't seen any 4" models for sale anywhere. The 5" ones are going for about $550. I was told to expect to pay $20-30 more for the 4" barrel. So $500 looks pretty good.... relatively speaking I mean.
What Mikey said.
If not a scratch or rub on it anywhere.....grab it.
Otherwise would be bout a 98 percenter or less and a little over 400 should do it.