Goodwill Etc.
Here in the Pittsburgh area the unwritten story is that someone negotiated first dibs on any vintage electronics that come into any of the stores. I find that hard to believe as an official agreement (how would it get past the board of a non-profit?) but it can definitely be true informally. So we rarely (read never) see vintage stuff in the stores. Whoever struck the deal must be doing well, because this area is saturated with vintage electronics, based on teh estate sales and CL ads.