If you are near Southern California; these guys are great and a throw back to another time. They have been selling McIntosh exclusively since 1957 in the same location. Its not a fancy place; just an old small shop and they repair anything McIntosh. They are older guys who know everything about any legacy or new McIntosh product.
I purchased my MA352 from them and they had MA352 and MA252 demos in stock last I checked. In fact they usually get most anything McIntosh quicker than big chains. The owner told me their relationship with NY goes back generations and they have a direct line to key people. So if you want it, they can somehow just get it.
They are not online and only open Saturday afternoons unless you call (really just Saturdays at the shop). Like I said a throw back to another age.