Stereo Emporium, Delaware Avenue, Buffalo NY. They opened around 1970 and I was one of their first customers. They started small with the usual Sherwood and other midfi stuff. Within a few years, they carried and demoed about every line except Mac. They also had a trade up program and store credit for regular customers. Great business while it lasted. Somebody else bought the business and it was closed within a short time, around 1985. I have visited many other high end stores since then in NY and Florida and none being as satisfying as Stereo Emporium.
I had to drive from the Westside to the Eastside if Detroit in the early 70's to get to Pecars which carried McIntosh Nakamichi and Absolute Sound where I bought my Ampzilla and DQ-10's. These two stores were just down the street from each other and I bought a lot of stuff at both.