Check out Ehead Audio, eheadaudio@comcast.net 925 324 2897
Dan has as extensive collection of used McIntosh equipment mostly from retiring dealers. He is an authorized McIntosh dealer for new equipment also. All my dealings with him were excellent. He went so far as to delivery demo equipment to my house, set it up, and allow us to use it for several days. Definitely deals in the high end market. While located in South San Francisco, he has an extensive customer base developed and expanded by word of mouth.