My impression is that the devastation that was the World Trade Center
took out NYC's second-hand electronics marketplace. That is, when the
WTC was put IN, in the 70's, they took down all the buildings that housed
the radio parts sellers. As for the IBM museum, I saw its incarnation in a
Westchester warehouse in 1991, it's a Great collection, but well out of
NYC even then.
A joke, son: Maybe your best bet is to find a 3rd rate electronics store
passing off a 1981 PC as "new".
(Hard to get past that $1,100 pricetag though <g>)
Someone else?
John A.