I recently bought a 4" 686 with RR/WO sights in excellent condition for $499 on GunsAmerica, but I think $550 is still a fair price for a gun like that. In the last 30 days, I've also bought a like-new 6" 686 for $450 but I paid $600 for a 6" PowerPort 686 that appears to be unfired. Both of those guns were on GunBroker.